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WORK

IN A HYPERBARIC ENVIRONMENT

Special preventive measures

- - - - -

Translation in English

Of the French Legislation

Which remains

The Sole Official Reference Text

French Legislation

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SUMMARY

• Decree n°90.277 of 28th March 1990Relating to the protection of workers operating in a hyperbaric environmentDecret n° 90.277 du 28 Mars 1990Relatif à la protection des travailleurs intervenant en milieu hyperbare

Page 3 to 12• Decree of 28 January 1991

Defining the procedures for safety training of personnel taking part in hyperbaricoperationsArrêté du 28 Janvier 1991 définissant les modalités de formation à la sécurité despersonnes intervenant dans les opérations hyperbares

Page 13 to 26• Decree of 28 March 1991

Defining recommendations to medical doctors responsible for the medicalsupervision of workers operating in a hyperbaric environmentArrêté du 28 Mars 1991 définissant les recommandations aux médecins du travailchargés de la surveillance médicale des travailleurs intervenant en milieuhyperbare

Page 27 to 33• Decree of 20 August 1991

Prescribing the conditions under which a derogation may be granted as regardsthe age limit for applying for a certificate of competence in hyperbaric operationsArrêté du 20 Août 1991 fixant les conditions de dérogation à l’âge limite pourpostuler au certificat d’aptitude à l’hyperbarie

Page 34 to 35• Decree of 15 May 1992

Defining the procedures to be used in a hyperbaric environment, as regardsaccess, work duration, evacuation and organization of workArrêté du 15 Mai 1992 définissant les procédures d’accès, de séjour, de sortie etd’organisation du travail en milieu hyperbare

Page 36 to 50• Order of 22 December 1995

Relating to the safety training methods of some marine equipment companiesoperating in a hyperbaric environmentArrêté du 22 Décembre 1995 relatif aux modalités de formation à la sécurité desmarins de certaines entreprises d’armement maritime intervenant en milieuhyperbare

Page 51 to 77

• Decree of 24th March 2000 modifying the Decree of 28th January 1991relating to the definition of procedures for safety training of personneltaking part in hyperbaric operationsDecret du 24 Mars 2000 Modifant le Décret du 28 Janvier 1991Définissant les modalités de formation à la sécurité des personnels intervenantdans des opérations hyperbares

Page 208 to 209

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AUTHOR : FRENCH GOVERNMENT

DECREE N°90-277 OF 28th MARCH 1990relating to the protection of workers operating in a hyperbaric environment.

DECRET N°90-277 DU 28 MARS 1990relatif à la protection des travailleurs intervenant en milieu hyperbare

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DECREE N°90-277 OF 28th MARCH 1990relating to the protection

of workers operating in a hyperbaric environment

(Journal Officiel of 29th March 1990)

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The Prime Minister,Acting on reports from the Minister of Equipment ofHousing, Transport and the Sea, the Minister ofLabour, Employment and Occupational Trainingand the Minister of Agriculture and Forestry,In consideration of the Labour Code, and inparticular articles L. 231-1, L. 231-2 and L. 231-3-1 ;In consideration of the Social Security Code, andin particular L. 461-2 ;In consideration of the Rural Code and in particulararticle 1170 ;In consideration of Law n°85-542 of 22nd May 1985amending the decree of 9th January 1852 on thepractise of sea fishing ;In consideration of decree n°63 of 18th January1943 amended, containing public administrationregulations on apparatus pressurized with gas ;In consideration of decree n°47-1592 of 23rd

August 1947 amended, containing publicadministration regulations concerning specialsafety measures relating to lifting equipment otherthan lifts and hoists ;In consideration of the decree n°68-48 of 8th

January 1965 amended, containing publicadministration regulations for the implementation ofthe provisions of book II of the Labour Code(section II : Health and Safety of Workers) asregards special measures for protection andhygiene applicable to establishments in whichpersonnel carry out building work, public works orany other work concerning buildings ;In consideration of decree n°77-196 of the 19th

August 1977 made in implementation of theprovisions of book II, section III, chapter V (firstpart : Legislative) of the Labour Code

as regard health and safety plans, inter-companyhealth and safety colleges and the setting up ofvarious channels and networks ;In consideration of decree n°77-1321 of 29th

November 1977 laying down special health andsafety requirements applicable to work carried outin an establishment by an outside firm ;In consideration of decree n°79-709 of 7th August1979 containing public administration regulationsconcerning safety measures applicable toagricultural establishments using lifts and hoistsand certain other lifting equipment :In consideration of decree n°81-183 of 24th

February 1981 regarding an extension toagricultural establishments of the provisions of thedecree of 8th January 1965 relating to specialprotection and hygiene measures applicable toestablishments in which personnel carry outbuilding work, public works and all other workconcerning buildings ;In consideration of decree n°82-150 of 10th

February 1982 regarding an extension toagricultural establishments of the provisions ofdecree n°77-1321 of 29th November 1977 layingdown special health and safety requirementsapplicable to work carried out in an establishmentby an outside firm ;In consideration of decree n°82-397 of 11th May1982 relating to the organisation and operation ofagricultural occupational medical services :In consideration of decree 82-727 of 19th August1982 regarding an extension of the provisions ofdecrees n°77-612 of 9th June 1977 and n°77-996of 19th August 1977 to the heads of agriculturalestablishments referred to in article L. 231-1 of theLabour Code ;

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In consideration of the advice given by the NationalCommission of Health and Safety at Work inAgriculture dated 6th June 1989 ;In consideration of the advice of the Council for thePrevention of Occupational Risks, dated 10th July1989 ;The Council of State (social section) having beenconsulted,

Decrees :

SECTION IFIELD OF APPLICATION - DEFINITIONS

Article 1

The provisions of the present decree shall beapplicable in establishments and on sites subjectto the provisions of article L.231-1 of Labour Codein which workers are called to operate at apressure greater than local atmospheric pressure.However, for activities for which the relativeoperating pressure remains permanently less than100 hectopascals (0.1 bar), only the provisions ofsection III and articles 2, 39, 40 and 41 of thepresent decree shall be applicable.

Article 2

The operating pressure is the absolute pressure atthe level of the respiratory tracts of the worker atthe moment when it reaches its maximum valueduring the period of work.The relative operating pressure is the operatingpressure less the local atmospheric pressure.

SECTION IICONDITIONS OF ACCESS TO A HYPERBARIC

ENVIRONMENTArticle 3

I - Work in a hyperbaric may only be carried out byworkers who are holders of a certificate ofcompetence in the field of hyperbaric operations,appropriate to the nature of such operations andwho are holders of an individual record book.

II - This certificate of competence shall indicateone of the classes or sub classes of hyperbaricwork to which the worker has access and shallmention the activity which he is entitled to practisein the field of hyperbaric operations. The threeclasses, defined as a function of the operatingpressure are as follows :• class I for a maximum relative pressure not

exceeding 4,000 hectopascal (4 bar) ;• class II for a maximum relative pressure not

exceeding 6,000 hectopascal (6 bar) ;• class III for a maximum relative pressure

greater than 6,000 hectopascal (6 bar).Class I comprises two sub classes :• class IA for a maximum relative pressure not

exceeding 1,200 hectopascal (1.2 bar) ;• class IB for a maximum relative pressure

greater than 1,200 hectopascal (1.2 bar).A decree issued by the Ministers responsible forLabour, Agriculture and the Sea, shall issue a listof categories of activity as well as the proceduresfor obtaining the certificate of competence inhyperbaric operations and the conditions underwhich training corresponding to each of theseactivities shall be ensured.III - The individual record specified in I above shallbe issued to any worker who is a holder of anaptitude certificate on completion of his initialtraining. This record book, the characteristics andmethods of presentation for which shall be definedby a decree issued by the Ministers responsible forLabour, Agriculture and the Sea, must include,other than details of the classification and mentionallocated to the worker, the date on which the lastmedical fitness record was compiled and theresulting opinion as to fitness, countersigned bythe company diving medical doctor.

Article 4

Only persons aged at least 18 and not older than40 may apply for a certificate of competence inhyperbaric operations. A decree issued by theMinisters responsible for

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Labour, Agriculture and the Sea, shall lay down theconditions under which any derogations may begranted for certain hyperbaric activities (1).

SECTION IIIBREATHING GASES

Article 5

For the execution of work in a hyperbaricatmosphere in the establishments and sitesspecified in article L.231-1 of the Labour Code,breathing of compressed air is permitted inaccordance with the requirements of article 7 and10 below, up to a relative pressure of 6,000hectopascals (6 bars).Above 6,000 hectopascal (6 bars), specificbreathing mixtures must be employed under theconditions laid down in the present section.

Article 6

Air or mixtures breathed in the course ofoperations must have :a - for carbon dioxide, a partial pressure of lessthan 10 hectopascals (10 millibars) ;b - for carbon monoxide, a partial pressure of lessthan 5 pascals (0.05 millibar) ;c - for water vapour, for periods of exposuregreater than 24 hours, a relative humidity ofbetween 60 and 80 % ;d - for oil vapours, a partial pressure expressed asmethane of less than 0.5 hectopascal (0.5 millibar)and a concentration of less than 0.5 mg/cm3 ;e - for dust, a maximum concentration less thanthe limits laid down the article R.232-5-5 of theLabour Code ;f - for dangerous vapours and gases, particularlysolvents and cleaning products, partial pressuresless than those corresponding to the exposure limitvalues at atmospheric pressure.The density of a breathing mixture must notexceed 9 grammes per litre at the operatingpressure unless a derogation is granted,particularly for purposes of scientific research,

by a decree issued by the Minister concerned.

Article 7

The partial pressure of nitrogen in a respiredmixture must be less than 5,600 hectopascals (5.6bars).

Article 8

OxygenI - The breathing of pure oxygen under pressurewith individual breathing apparatus shall bereserved for periods of decompression inaccordance with the tables defined by a decreeissued by the Ministers responsible for Labour andAgriculture or shall be reserved for periods oftreatment following accidents connected with highpressures.

II - The partial pressure of oxygen in a breathingmixture must not be less than 160 hectopascals(160 millibars).

III - The partial pressure of oxygen in a breathingmixture must not exceed the following values :a - During a period of physical activity, excludingthe phases of compression and decompressionand for continuous periods of exposure notexceeding respectively 3, 4, 5, 6 and 8 hours :1,600 hectopascals (1.6 bar), 1,400 hectopascals(1.4 bar), 1,200 hectopascals (1.2 bars), 1,000hectopascals (1 bar) and 900 hectopascals (0.9bar) ;b - During the decompression phase insubmersion 1,600 hectopascals (1.6 bars) ;c - During the phase of dry decompression, 2,200hectopascals (2.2 bars) for decompression duringa period less than 24 hours and 800 hectopascals(0.8 bar) for decompression during a periodgreater than 24 hours ;d - During phases of compression or rest atsaturation, between 300 hectopascals (0.3 bar)and 450 hectopascals (0.45 bar) ;e - During emergency recompression after a

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decompression accident, 2,800 hectopascals (2.8bars) unless prescribed medically.The partial pressure of oxygen must be evaluatedwith a precision of 50 hectopascals (50 millibars).The partial pressure of oxygen in a hyperbaricworking chamber must never exceed 25 % of thetotal pressure.

Article 9

Diluent gases for oxygen.The conditions for the use of diluent gases foroxygen and their concentration in a breathing gasmay be laid down by a decree issued by theMinisters responsible for Labour and Agriculture.

Article 10

Air and breathing mixtures prepared in theestablishment or on site.Air and mixtures provided by compressors andintended for breathing under pressure must beanalysed after any new installation has beenassembled and then at least once a year, as wellas after an anomaly has been noted or after anyrepairs to the installation.These analyses should enable compliance with theprovisions of article 6 above to be verified.Air drawn into compressors must be from a localitywhich does not present any risk of pollution,particularly from engine exhaust gases, oil orhydrocarbon vapour fogs, carbon dioxide orcarbon monoxide.In addition, for breathing mixtures prepared in theestablishment, the employer must verifycompliance of these with the provisions of article 7,8 and 9.

Article 11

Breathing mixtures prepared outside theestablishment or site.Mixtures intended for breathing under pressuremay only be sold if accompanied by an analyticalguarantee certificate which shall

enable the employer to verify the compliance withthe provisions of article 6, 7, 8 and 9 above.

Article 12

Adaptation of breathing mixtures to hyperbaricactivities.The employer must provide breathing mixturessuitable, as regards composition and temperatureto the working pressure and the phases ofcompression, decompression and rescue and ofany treatment which might take place.He must in addition, before use, verify by analysis,the conformity of the oxygen content of mixtureswith the provisions of article 8.

SECTION IVCOLLECTIVE EQUIPMENT

Article 13

Other than specific equipment suited to ahyperbaric situation and necessary for the workundertaken, collective equipment shall comprise ;a - means of access to, residence in andevacuation from the hyperbaric situation ;b - means for monitoring workers in the hyperbaricsituation ;c - means of production, transfer, storage,distribution and control of breathing gases ;d - means of rescue (resuscitation, fire,recompression).Decrees issued by the Ministers responsible forLabour, Agriculture and the Sea, may give detailsof the technical specifications which, for certainhyperbaric situations, this equipment must satisfy.

Article 14

A means of access suited to the hyperbaricsituation, or to submersion, must be available inorder to enable workers to be pressurized inaccordance with the procedures described in thehyperbaric procedure and safety manual laiddown in article 29 and for at least one

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person to bring assistance to a person underpressure.A means of evacuation from the hyperbaricsituation must be permanently available ;It must be enable workers who may be injured orunconscious as well as persons assisting them, tobe decompressed, and if necessary, to leave thewater.

Article 15

Means of supervision.Any worker operating under pressure must besupervised from a control post situated in a localityunder local atmospheric pressure, having meansof communication, alarm and rescue andnecessary information on the pressure in theworking locality, the nature of the breathing gasesand the volumes of available gas stocks.

Article 16

Pressure equipment.I - The use of a bursting disc for protectingpressure chambers which can be manned isprohibited. This protection must be provided bymeans of a calibrated pressure valve.In addition, an easily accessible rapid closurevalve, placed between the calibrated pressurevalve and the chamber concerned, kept in theopen position and sealed by means of a wire witha lead seal, must be used to isolate this pressurerelief valve.II - The dates of hydraulic tests must be carried ina conspicuous manner and standardized colourcodes must be used on storage containers andpiping.III - The colours of marks carried by storagecontainers and piping as well as conformity markson connections used for gas distribution circuitsshall be defined by a decree issued by theMinisters responsible for Labour, Agriculture andthe Sea.IV - Premises in which pressurized gases arestored, must comply with the specificationsgoverning protection against fire, laid down inArticles R. 233-14 to R. 233-41 of the Labour

Code.

Article 17

The use of single place pressure chambers withoutan airlock for personnel is forbidden.

Article 18

Decrees issued by the Ministers responsible forLabour, Agriculture and the Sea, may lay down,according to use or destination, the operationrequirements applicable to manned pressurizedchambers, particularly to recompressionchambers, saturation chambers, to hyperbaricoxygen therapy chambers, to diving bells, toairlocks for personnel in tunnel boring and tosubmerged pressure chambers operating withcompressed air.

Article 19

Pressure reducers for converting the gas pressurein a reservoir to a suitable working pressure mustbe maintained in a good operational state andmust be inspected at least once a year.When the failure of a pressure reducer can bringabout a loss of pressure for personnel, thecorresponding gas circuit must be protected by anon-return valve.

Article 20

In order to counter the effect of any failure in thesupply to a breathing apparatus or a mannedpressurised chamber, an emergency gas supply ora compressor with a buffer reservoir must beimmediately available.

Article 21

Flexible supply hoses for breathing apparatus mayonly be used at pressures less than half theirservice pressure as printed on the hoses. Thepressure in flexible operational tubing must beequal to the service pressure of the

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other components of the installation.It must be possible to uncouple connections usedon these flexible hoses when under pressure.All connectors for flexible hoses must have atensile strength equal to that of the flexible hosesthemselves.

Article 22

Compressors and equipment for transferring gasmust be lubricated with products which do not giveoff vapours which are dangerous, within themeaning given in Articles L. 231-6 and L. 231-7 ofthe Labour Code.Means must be provided which will enable it to bedecided whether a purification device should beexchanged or cleaned when saturated.

Article 23

Means of rescue.Emergency kits must be available on site insufficient numbers, comprising at least one oxygeninhaler and a first aid kit.The employer must in addition ensure that arecompression chamber is available in the case ofaccident, corresponding to the number of personsoperating simultaneously under pressure, as wellas personnel qualified to operate this chamber.The access period to this chamber may in no caseexceed two hours ; decrees issued by theMinisters responsible for Labour and Agricultureand the Sea may lay down lower periodsaccording to the nature of exposure to ahyperbaric risk.

Article 24

Risk of fire.Every provision must be made for the prevention offire inside and outside chambers.Fire extinguishers inside manned chambers mustbe effective at atmospheric pressure.Fire extinguishers outside pressurized

chambers must take account of the specialsituation of workers under pressure, of thepresence of compressed gas and whereapplicable the presence of oxygen.Means of survival in a smoke filled atmospheremust be available for workers operating mannedchambers.

SECTION VINDIVIDUAL EQUIPMENT

Article 25

The employer must provide protective clothingsuitable for the hyperbaric situation concerned,breathing equipment, emergency breathingequipment and accessories appropriate tomethods of operation and rescue and as required,an emergency gas reservoir.

Article 26

Breathing apparatus must provide air or thebreathing mixture automatically, without excessiveresistance, at a pressure corresponding to that ofthe level at which the worker is operating.

Article 27

Decrees issued by the Ministers responsible forLabour, Agriculture and the Sea, may specify, inrelation to the various hyperbaric situations, theminimum characteristics with which this equipmentmust comply.

SECTION VISAFETY PROCEDURES

Article 28

I - The employer must prepare a manual givingsafety procedures in a hyperbaric environment andmust put it at the disposal of any worker involved inwork under hyperbaric conditions.

II - The employer must define the general rulesappropriate to the establishment :

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a - The respective functions and roles of variouspersons taking part in operations, in particularthose of the person in charge of the operationspecified in article 30 below, of the supervisor, ofpersonnel situated in a hyperbaric environmentand of rescue personnel ;b - The equipment required according to theoperating methods employed by the firm and thechecks which must be made before they are putinto operation ;c - The procedures decided on by the employer forthe various operating methods in particular asregards the choice of gases, compression anddecompression tables, operational and rescueprocedures and procedures to be followed in theface of accidents connected with hyperbaricoperations ;d - Safety rules to be observed in the course ofvarious types of operation ;e - Limitations to travelling on board aircraftfollowing hyperbaric operations ;f - The items defining a site which must be takeninto account when operations peculiar to each siteare carried out and in particular knowledge of thepremises, weather conditions, interference withother operations, operating pressure, outsiderescue facilities available and alarm procedures.

III - The hyperbaric safety manual and itssuccessive amendments shall be previouslysubmitted to the medical doctor and to the Healthand Safety and Conditions of Work Committee fortheir opinion, or failing this, to personnel delegates.In addition, it shall be held at the disposal of theinspector who may order the employer to carry outany modifications which are necessary, within aspecified time.

Article 29

The employer must make available for any workerinvolved in hyperbaric operations, a site documentdefining the methods, normal procedures andrescue procedures relating to

the said operation.

Article 30

Any operations carried out in a hyperbaricenvironment must be directed by a head ofoperations designated by the employer andcapable to carrying out operations in a hyperbaricenvironment. The employer must provide the headof operations with a copy of the manual coveringprocedures and safety under hyperbaricconditions.The head of operations, in accordance with thismanual, shall take any measures necessary toensure the safety of workers on this site operatingunder pressure, under the responsibility of theemployer.

Article 31

Any worker operating under pressure must bemonitored continuously until he returns toatmospheric pressure, by a competent personpresent in a control station as defined in article 15above ; this person may be, if the nature of theoperation permits it, the head of operationsreferred to in article 30 above.In addition, at least one person holding a certificateof competence in hyperbaric operations, must beable to operate at any moment in a hyperbaricenvironment in order to offer assistance to workersunder pressure ; a decree issued by the Ministersresponsible for Labour, Agriculture and the Sea,may however define conditions under whichderogations may be granted to all or part of theserequirements and shall lay down, in thesecircumstances, equivalent measures forguaranteeing the safety of workers underpressure.In any circumstances, the employer shall beobliged to inform the inspector without delay ofderogations which he would be led to consider byvirtue of the present article ; he should in additionnotify workers concerned in writing of the nature ofthe equivalent requirements appropriate forguaranteeing their safety.

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On each site where hyperbaric operations arecarried out, at least one member of personnel mustbe specially trained to give first aid in cases ofemergency and to put into practise the procedureslaid down in article 23 above.When the recompression chamber is not situatedon site, the employer must ensure that qualifiedpersonnel are also available for operating it.

Article 32

The minimum composition of teams engaged inhyperbaric operations, limitations to the durationand frequency of periods under pressure, methodsand procedures governing compression,decompression under normal conditions or in caseof accident, the period of exposure to high oxygenpressures, training procedures and criteriaconcerning the fitness of persons specified inarticle 30 and 31, as well as the conditions underwhich derogations may be applied to theprovisions thus laid down, shall be defined bymeans to a decree issued by the Ministersresponsible for Labour, Agriculture and the Sea.

SECTION VIIMEDICAL SUPERVISION

OF PERSONNELArticle 33

I - A worker may only be required to carry outoperations in a hyperbaric environment if medicalrecords prepared in application of article R. 241-57of the Labour Code or of Article 40 of the decree of11th May 1982 referred to above, certifies that nomedical contra-indications exist relating to theseoperations ; for persons more than 40 years oldthis record shall be prepared every six months.II - The worker or employer may question theentries in this fitness record within fifteen daysfollowing its issue.The dispute shall be heard before the inspector.The latter shall give his ruling following the assentof the regional industrial

medical inspector who may order additionalexaminations to be carried out by specialists of hischoice at the expense of the employer.III - Without prejudice to the provisions of article R.241-51 of the Labour Code or, if an agriculturallabourer is involved, of article 33 of the decree of11th May 1982 referred to above, the employershall be obliged to have any worker who has beenthe victim of a hyperbaric incident or who declareshimself to be unwell on account of the work inwhich he is employed, to be examined by themedical doctor.

Article 34

Medical examinations carried out inimplementation of the preceding article mustinclude a general clinical examination andsupplementary specialized examinations. Theseexaminations shall be carried out at the expense ofthe employer.A decree issued by the Ministers responsible forLabour, Agriculture and the Sea shall definerecommendations to the medical doctor and the listof supplementary specialized examinations.

Article 35

A special medical record shall be kept by themedical doctor for each worker required to work ina hyperbaric environment.Reference to this record shall be made in thedoctor’s ordinary medical record file specified inArticle R.241-56 of Labour Code or in Article 39 ofthe decree of 11th May 1982, referred to above.This medical record shall contain :1° A record card relating to the operatingconditions of the worker, in which specialreference shall be made to the nature of workcarried out in a hyperbaric environment, theduration of periods under pressure and other risksto which the worker may be exposed ;2° The dates and results of analyses and medicalexaminations carried out in application of Article33 above, as well as

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Article 36

The employer shall be required to provide rapidmeans of transport enabling a medical doctor toreach the victims of an accident. The employer orhead of operations must notify the doctorimmediately in the event of an accident.

SECTION VIIIVARIOUS PROVISIONS

Article 37

The individual record book as well as thecertificate of competence in hyperbaric operations,defined in Article 3 above, must be, for eachworker concerned, kept at the disposal of theinspector and official of the prevention departmentof the relevant social security organization.In addition, the employer must present theoperating manual defined in Article 28 above aswell as operating sheets and reports on tests andchecks made in application of the present decree,when asked to do so by the inspector or an officialof the prevention department of the relevant socialsecurity organization.

Article 38

The following must be displayed on the site wherehyperbaric operations are carried out :a - The name of the person specified in Article 31for carrying out first aid ;b - The name and address of the company divingmedical doctor and of specialised medicalassistance designated by him in case of accident ;c - The address and telephone number of therecompression centre which is able to act in thecase of an accident associated with work underpressure ;d - The address of the department of occupationalmedicine where medical examinations are carriedout.

Article 39

As regards persons occupied as sailors, the dutiesallocated by the present decree to the medicaldoctor shall be carried out by the naval doctor,those allocated to the inspector by the local officerin charge of maritime affairs, those allocated to themedical inspector for occupations and manpowerby the chief regional medical officer for maritimeaffairs, and those allocated to personnelrepresentatives by ship’s representatives.

Article 40

Decrees n° 74-657 of 9th July 1974 and n° 74-725of 11th July 1974 are repealed.The words « Compressed air - Work incompressed air » which appear in the firstparagraph of Article R. 234-9 of the Labour Codeare to be deleted.

Article 41

The present decree comes into force on the firstday of the seventh month following its publicationin the « Journal Officiel » of the French Republic.

Article 42

The Minister for Equipment, Housing, Transportand the Sea, the Minister for Agriculture andForestry and the Deputy Minister for Equipment,Housing, Transport and the Sea, responsible forthe Sea, shall be responsible, as it concerns eachof them, for the implementation of the presentdecree, which shall be published in the « JournalOfficiel » of the French Republic.

Issued in Paris, 28th March 1990.MICHEL ROCARD

In the name of the Prime Minister :The Minister of Employment andLabour and Occupational Training,JEAN-PIERRE SOISSON

The Minister of Equipment,Housing, Transport and the Sea,MICHEL DELEBARRE

The Minister of Agriculture and Forestry,HENRY NALLET

The deputy Minister for Equipment,Housing, Transport and the Sea,Responsible for the Sea,JACQUES MELLICK

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FRENCH GOVERNMENT

DECREE OF 28th JANUARY 1991defining the procedures for safety training of personnel taking part inhyperbaric operations

ARRÊTE DU 28 JANVIER 1991définissant les modalités de formation à la sécurité des personnesintervenant dans les opérations hyperbares

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DECREE OF 28th JANUARY 1991defining the procedures for safety training of

personnel taking part in hyperbaric operations

(Journal Officiel of 2nd March 1991)

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The Minister of Agriculture and Forestry, theMinister of Employment, Labour and OccupationalTraining and the Minister Responsible for the Sea,In consideration of the Labour Code, in particularArticles L.231-3-1 and R.231-32 to R.231-45 ;In consideration of decree n° 90-277 of 28th March1990 relating to the protection of workers operatingin a hyperbaric environment, in particular itsArticles 3 and 32 ;In consideration of the advice given by the NationalCommittee for Health and Safety in AgriculturalWork ;In consideration of the advice given by the councilfor the Prevention of Occupational Risks,Decree :

SECTION ILIST OF CATEGORIES OF ACTIVITYIN A HYPERBARIC ENVIRONMENT

Article 1

In accordance with the requirements of paragraphII of article 3 of the decree referred to above, thecertificate of competence in hyperbaric workingmust comprise, in addition to a reference to theclass or sub class to which the worker has access,at least one reference relating to the activitycarried out under hyperbaric pressure, selectedfrom the following :

Mention A : the activity of diverMention B : other underwater activitiesMention C : medical hyperbaric activitiesMention D : other hyperbaric activities.

The list of main activities associated with each ofthese categories is defined in annex I of thepresent decree.

Persons whose certificate of competence inhyperbaric operations bears the mention referenceA may in addition claim the right to carry out anactivity corresponding to categories B, C and D,provided that these persons limit themselves toclasses of hyperbaric work to which they haveaccess.Persons whose competence certificate inhyperbaric operations comprises mention B maycarry out a corresponding activity in mention C andD.

SECTION IIPROCEDURES FOR OBTAINING ACERTIFICATE OF COMPETENCEIN HYPERBARIC OPERATIONS

Article 2

I - The competence certificate in hyperbaricoperations shall be issued to any competentperson, within the meaning of article 33 of thedecree referred to above, who has successivelycompleted appropriate training in hyperbaricoperations.II - This training shall be given by an organizationapproved by the Ministers responsible for Labourand Agriculture, under the conditions defined inarticle 4 below ; for training organizations forpersonnel in naval supply firms, approval shall begranted by the Minister responsible for the Sea.However, for candidates in class I of categories Band D and in classes I and II of mention C, thistraining may be ensured under the conditionsspecified in IV below, by the employers themselvesas soon as they have authorization from theRegional Director of Employment and Labour, ofthe Head of the Regional Inspection Departmentfor Employment, Labour and Social AgriculturalPolicy or from the Regional Director of

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Maritime affairs, whichever is appropriate.At the end of training, the approved organization orthe authorized employer shall end the results tothe National Institute for Professional Diving andfor Operations in an Aquatic and HyperbaricEnvironment (I.N.P.P.) who shall prepare thecorresponding certificate and individual recordbook specified on I of article 3 of the decree of 28th

March 1990 referred to above, within a period ofone month.III - Persons who are holders of one of thediplomas listed in annex III of the present decreemay apply for exemption from all or part of thetraining. In this case a request shall be addressedto the I.N.P.P. who, under the conditions whichthey shall lay down, grant the appropriatecertificate of competence, in accordance with therequirements of I above.

Article 3

The certificate of competence in hyperbaricoperations shall be granted for a period of tenyears .Its period of validity may be extended under theconditions laid down in it, and on the initiative ofthe I.N.P.P., for successive periods of ten years,following an application as submitted by the holder.This application shall be accompanied by thesections of the individual record, specified inparagraph I of article 3 of the Decree n°90-277 of28th March 1990 referred to above, which provethe identity, the certification and competence of theapplicant, as well as statements giving the natureand duration of employment carried out during theperiod concerned and for which certification isrequired. Employers shall be obliged to providethese statements ; other documents proving inparticular the nature and duration of employmentcarried out during the period under considerationmay be provided by the person concerned at therequest of the aforementioned institute.Any dispute concerning decisions taken by virtueof the preceding paragraph shall be heard by theMinister responsible for Labour.

Under no circumstances will any extension begranted to a person who has not participated inany employment corresponding to thesecertificates during the relevant period.

Article 4

The training of workers operating in a hyperbaricenvironment shall be for the purpose of enablingthem to carry out their activities in accordance withthe individual and collective safety rules.To this end, teaching programmes shall distinguishthe items which result from access to a particularpressure class or sub class, and consequently,those items of training which are specific to eachmention and will be common to all activities.Joint training shall aim at giving the candidate thetheoretical and practical knowledge which isindispensable to his access to, maintenance in,and evacuation from, the hyperbaric medium at agiven pressure.Training relating to each mention shall aim atillustrating the general principles for eachhyperbaric class in relation to equipment andprocedures peculiar to each activity which is thesubject of a particular mention.Annex II of the present decree shall define theobjectives which joint and optional training mustsatisfy, as a function of the classes and categoriesconcerned.

SECTION IIICONDITIONS FOR THE APPROVAL OF

ORGANIZATIONS GIVING TRAININGTO WORKERS OPERATING IN A

HYPERBARIC ENVIRONMENTArticle 5

Organizations which are able to provide training ofworkers operating in a hyperbaric environmentwith a view to obtaining the certificate ofcompetence in hyperbaric working shall beapproved by means of a decree issued by theMinisters responsible for Labour and Agriculture,following consultation with the Committee of the

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Council for the Prevention of Occupational Riskswhich specializes in chemical and biological risksand those resulting from physical environments,and following consultation with the National Healthand Safety in Agriculture Committee.The organization must be able to ensure thatapplicants for certification shall be competentwithin the meaning of article 33 of decree n° 90-277 of the 28th March 1990 referred to above. Theapproved training organization may not train itsown personnel, subject to the provisions of article2, paragraph II.

Article 6

Requests for approval shall be addressed to theMinister responsible for Labour (subsidiarydepartment dealing with conditions of work andprotection against occupational risks), 1, place deFontenoy, 75007 Paris, by the responsiblerepresentative of the organization applying forapproval, before the 31st October of each year, inorder for these applications to take effect on the 1st

January of the following year.For personnel training organizations of navalsupply firms, applications for approval shall beaddressed to the Minister responsible for the Sea(subsidiary department dealing with seamen), 3,place de Fontenoy, 75707 Paris.As a temporary measure, applications madeduring the 30 days following publication of thepresent decree may result in approval limited toone year.

Article 7

Each application for approval must beaccompanied by a dossier including :1° A document giving the legal status, the nameand address of the head office of the organizationand the surname and forenames of theresponsible person of the organization as well ashis level of training, and where appropriate, hisuniversity degrees ;2° A list of the names of persons who will be calledupon to give training with, for each of

these, the details required in 1° above. Thesepersons must be contractually bound to theorganization which will benefit from approval ;3° The nature of approval requested, indicating theclasses, subclasses and categories for which theorganization intends to provide training ;4° The intended detailed training programmewhich must comply with the guidelines annexed tothe present decree as well as the place where it isintended to provide training and details of theconditions governing the selection of candidates ;5° Details of the duration and frequency of trainingsessions, as well as the conditions and proceduresunder which examinations will take place,particularly on the composition of examiningboard ;6° The technical and safety procedures which willbe put in operation within the framework of thistraining ;7° Where appropriate, the dwell times envisagedin a hyperbaric environment for each pressurerange ;8° The fees for this training according to thevarious options.If, in the course of the period for which approval isgranted, changes take place concerning thetraining programme, the equipment used, theorganization of training sessions andexaminations, the list of names of persons carryingout training or the fees levied, the organizationshall be obliged to inform the Minister responsiblefor Labour or the Minister responsible for the Seaof such changes.

Article 8

I - Approval shall be granted for a period of threeyears on a renewable basis.At the end of each period of approval, theorganization must submit the dossier specified inarticle 7, with a view to renewing approval,accompanied by details of the training carried out.II - Inspections may be carried out at any

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moment by organizations or persons qualified anddesignated according to the case concerned, bythe Minister responsible for Labour or the Ministerresponsible for the Sea, with a view to ensuring thequality of the training provided, the conditionsunder which examinations are carried out and theapplication of safety regulations during training.III - Approval may be withdrawn at any time if itappears that the clauses which applied at the timeof granting have not been complied with.

SECTION IVCONDITIONS GEVERNING THE

AUTHORIZATION OFESTABLISHMENTS TO CARRY OUT

THEIR OWN TRAINING OF WORKERSOPERATING IN A HYPERBARIC

ENVIRONMENT

Article 9

An employer who applies for the authorizationreferred in paragraph II of article 2 above, mustsend, as appropriate, to the Regional Director forEmployment and Labour, to the Head of theRegional Department for the Inspection ofAgricultural Employment and Labour and SocialPolicy or to the Regional Director for MaritimeAffairs, a request indicating :

1° The name and address of the head office of thefirm and establishment as well as the place wheretraining will take place ;2° The surname, forenames and title of the personwho is making the application ;3° The list of names and qualifications of personshe will use to provide training. These persons shallbe contractually bound to the person receivingauthorization ;4° The nature of the authorization requested,indicating the classes, subclasses and categoriesfor which it is intended to provide training ;5° A detailed programme of the intended

training which must comply with the guidelinesannexed to the present decree as well as theconditions for the selection of candidates ;6° Details of the duration and frequency of trainingsessions, as well the conditions and proceduresunder which examinations are carried out ;7° The technical and safety procedures which willbe put into practise within the framework oftraining ;8° Where applicable, the intended duration periodsin a hyperbaric environment for each pressurerange.

Article 10

Authorization shall be granted, followingconsultation with the I.N.P.P., as applicable, by theHead of the Regional Department for theInspection of Agricultural Employment Labour andSocial Policy or by the Regional Director forMaritime Affairs, under the conditions that he shalllay down, and within a period of two monthscounting from submission of the application : thisauthorization may be revoked.Inspections may be carried out any time by theinspector with a view to ensuring the quality oftraining, the conditions under which examinationstake place and the safety regulations put intopractice.

SECTION VCHARACTERISTICS AND PROCEDURES FOR

THEPRESENTATION OF THE

INDIVIDUAL RECORD BOOKArticle 11

The individual record book specified in article 3 ofthe decree of the 28th March 1990 referred toabove, must contain, in addition to a nationalregistration number, at least the followinginformation :• the surname, forename, date of birth, address,

photograph and signature of the holder ;

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• date on which the certificate in hyperbaricoperations was obtained and the name of theorganization which provided training ;

• the class and mention of hyperbaricoperation ;

• the date of medical examinations andresulting opinion regarding fitness ;anyrestrictions on hyperbaric working ;

• the registration of hyperbaric operationscarried out by the holder, certified by the headof hyperbaric operations or the employer.

SECTION VIPROCEDURES GOVERNING THE

DESIGNATION AND TRAININGOF THE HEAD OF

HYPERBARIC OPERATIONSArticle 12

In any establishment or on any site subject to theprovisions of decree n°90-277 referred to above,operations in a hyperbaric environment shall becarried out in accordance with article 30 of theaforementioned decree, under the on-site directionof a head of hyperbaric operations designated bythe employer.The function of this person, under the responsibilityof the employer, shall be ensure the safety ofworkers operating under pressure, that is to say toensure that protection measures are compliedwith, in particular those laid down in the hyperbaricsafety manual, to take note of dangerous situationsor methods of working, to establish normal andrescue procedures, to participate in the safetytraining of workers operating on a site inapplication of articles L.231-3-1 and R.231-34 toR.231-45 of the Labour Code and finally, in case ofaccident, to draw up a circumstantial report.

Article 13

The employer must ensure beforehand that theperson he designates is able to carry out his

task as head of hyperbaric operation and wherenecessary provide him with appropriate training.In any case, written instructions must be drawn upby the employer laying down the scope of this task.

SECTION VIIPROCEDURES FOR THE

DESIGNATION AND TRAINING OFTHE SUPERVISORY PERSON IN THE

HYPERBARIC OPERATIONSCONTROL POST

Article 14

The employer, in accordance with the provisions ofarticle 31 of the decree of 28th March 1990 referredto above, must designate a competent person tosupervise the worker or workers operating underpressure.This person must have previously undergoneappropriate training and received writteninformation regarding technical and safetyoperating conditions.For operations requiring the employment ofworkers in mention A, the supervisor in the controlpost, if he is not himself the holder of a certificateof competence in hyperbaric operations formention A, must follow a course of trainingapproved by the I.N.P.P.

SECTION VIIIPROCEDURES FOR THE DESIGNATION OF

RESCUE PERSONNEL

Article 15

The employer must designate a person who shallbe able to rescue workers in difficulty who areoperating in a hyperbaric environment ; thisperson, who shall be the holder of a certificate ofcompetence in hyperbaric operations compatiblewith the operation being carried out, must beequipped and trained for an immediate rescueoperation.

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SECTION IXFINAL PROVISIONS

Article 16

As a temporary measure, within the 24 monthsfollowing the publication of the present decree,operators having obtained access to work in ahyperbaric environment before the 1st October1990, and who do not belong to naval supply firms,will be classified by the Minister responsible forLabour, when proposed by a committee presidedover by his representative and which shallcomprise medical specialists in hyperbaricoperations and representatives of organizationswho are the most representative of the employersand workers concerned.In the same way, those who have obtainedprofessional access to work in a hyperbaricenvironment before the 1st October 1990 and whobelong to naval supply firms shall be classified bythe Minister responsible for the Sea.Candidates for classification must provide adossier giving details of their capacity, addressedto the Minister responsible for Labour or theMinister responsible for the Sea, as the case maybe.The classification this established shall be grantedby means of a certificate of competence inhyperbaric working.

Article 17

The Director of Labour Relations, the Director ofOperations, Social Policy, and Employment andthe Director of Seafarers and GeneralAdministration, shall be responsible, as it concernseach of them, for the implementation of the presentdecree, which will be published in the JournalOfficiel of the French Republic.

Issued in Paris, 28th January 1991.

The Minister of Employment,Labour and Occupational Training,For and on behalf of the Minister :The Director of Labour Relations,O. DUTHEILLET DE LAMOTHE

The Minister of Agriculture and Forestry,For and on behalf of the Minister :In the absence of the Director of Operations,social policy and employment :Head of department,J. LENOIR

Deputy Minister for the Sea,For and on behalf of the Minister :The Director of Seafarersand General Administration,C. BERNET

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ANNEX IINDICATIVE LIST OF

ACTIVITIES CARRIED OUTIN A HYPERBARIC ENVIRONMENT

Mention A - Activity of diver

This mention concerns workers whose mainactivity consists of operating in an underwaterenvironment in order to carry out civil engineeringoperations, maritime work, work in the oil fields orindustrial work, etc.Taking into account the nature of the workcorresponding to mention A and the resultingconstraints as regards safety, it is not possible,regarding this mention, to apply for the singlesubclass IA such as is defined in II of article 3 ofthe decree of 28th March 1990 referred to above.

Mention B - Other underwater activities

This mention concerns workers whose mainoccupation is not to carry out underwater work, butwho may be called on to carry out their occupationwhilst submerged.By way of example this mention will include thefollowing activities :-scientific activities (oceanographers, biologists,archaeologists, etc.) ;-entertainment and media activities(photographers, cameramen, lighting experts,actors, etc.) ;-security and safety activities (rescue workers,public safety, firemen, etc.) ;-aquaculture activities (aquaculture workers, seafishers, coral fishers, oyster farmers, etc.).

Mention CMedical high pressure activities

This mention concerns personnel whose work it isto operate medical hyperbaric installations(doctors, nurses, nursing auxiliaries, technicians,etc.).

Mention D - Other hyperbaric activities

This mention concerns all other personnel whooperate in a hyperbaric environment without beingsubmerged in water (pressure chamber workers,high pressure welders and those who carry outexperimental simulated diving operations in a dryenvironment, etc.).

ANNEX IITRAINING OBJECTIVES

A - Training in underwater operations

The objectives defined below do not take accountof the criteria governing access to a given trainingprogramme which may, as circumstances demand,be provided for novices.

1 - MENTION A1.1 - For class I

1.1.1 - General trainingThe objectives shall be :To receive a level of general technical training inthe use of the usual industrial documents (plans,planning diagrams, charts, equipment descriptions,procedures) and in the handling of currentequipment used on a surface site.To have a level of theoretical training sufficient forunderstanding and carrying out necessarycalculations using diving data (decompressiontables, physical concepts of gases, analyses,chronometric measurements, buoyancy orweighing calculations, etc.).To be able to take part in team work.To be a rescue worker, with the resuscitationoption.1.1.2 - Physical trainingTo be an experienced swimmer with standardscuba diving equipment.1.1.3 - Specific theoretical traininga - Regulations : knowledge of the relevant Frenchregulations.

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b - Physics and physiology of diving :Knowledge of the laws of physics applicable todiving and to underwater work ;Knowledge of physiopathological effects andpressure as well as preventive measures ;Knowledge of operating procedures usingdecompression tables for diving with air and withsuperoxygenated mixtures ;Knowledge of symptoms and emergencyprocedures applicable on site for accidents directlyconnected with diving.c - Equipment and associated safety rules to 40meters :Knowledge of equipment used for scuba diving orwith a hookah ;Knowledge of a recompression chamber ;Knowledge of air compressors (low and highpressure) purification and storage of air, qualitycriteria for respirable air ;Knowledge of electrical risks in underwatersituations and corresponding safety rules ;Knowledge of safety rules concerning theoperation of the principal underwater equipment ;Site organization : decompression in water ;Sailing : boat permit A - limited radio telephonistscertificate.d - Risks and safety rules regarding the use ofexplosives.

1.1.4 - Practical traininga - A mastery of diving methods, procedures andnecessary equipment :Scuba and hookah using air or a superoxygenatedmixture ;Surface decompression and practical siteorganization.b - Use and maintenance of individual equipment :wet and/or dry clothing,warm water clothing,pressure reducers, face masks, helmets withcontinuous flow and flow on demand,safety means for emergency surfacing (buoys, lifejackets),underwater telephones,individual signalling means.

c - Safety in the use of the main equipment to beused for underwater work :• search,• cutting and welding,• means for lifting (safety brake, cranes),• various types hydraulic apparatus,• TV, photography, subaquatic metrology,• Use of water jets under pressure,

contamination, decontamination,• Underwater lighting,• Explosives.

d - Role of rescue diver.e - Use of surface equipment :• Compressors, boiler, gas storage,• Recompression chamber and gas analyser,• Small craft, means for recall.

f - Preparation of documents :• Keeping diving records sheets,• Preparing technical or accident reports,• Drawing up technical or accidents reports.

g - Special working conditions (night, low visibilityand with current).h - Practical exercises in safe diving underexceptional conditions :• Dangerous environment (toxic, hot, polluted,

radio active, etc.),• In a tunnel.

1.2 - For Class II

In addition to training corresponding to theobjectives of Class I.1.2.1 - Theoretical trainingDiving from a vessel with dynamic positioning :• Open wet bell,• Rescue, resuscitation option,• Synthetic mixtures based on nitrogen.

1.2.2 - Practical trainingUse of open wet bell.Extension of diving methods in a zone 40 - 60metres deep, including the role of the rescue diver.Practical rescue work, resuscitation option.Use of warm water clothing.

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1.3 - For Class III

In addition to the training of class II mention A andeffective working experience in this class.1.3.1 - Theoretical trainingRevision of diving theory with supplementarytraining for diving in synthetic mixtures :Constitution,Manufacturing methods,Corresponding analysis,Physiology of high pressures (HPNS),HPNS symptoms in decompression sickness insaturation.Concepts of decompression and saturation diving :Knowledge of the method of saturation diving(parametric procedures),Controls, analytical principles and principles ofatmospheric regeneration.Description of diving equipment with system :Pressure chamber, diving bell, regeneration, gasproduction, analyzers,Individual gas recovery equipment,Vessels with dynamic positioning,Hyperbaric evacuation.Fire safety regulations.Applicable regulations, knowledge of rulesapplicable abroad.1.3.2 - Practical trainingNecessary experience to carry out the followingoperations in safety and under supervision :Incursion diving in a bell (at least 100 metres),Saturation diving (at least 100 metres),Saturation monitoring,Analysis,Role of rescue diver in a bell,Use of equipment at great depths,Completion of documents associated with deepdiving.

2 - MENTION B2.1 - For sub class IA and for class I

2.1.1 - General trainingTechnical training in the operation andmaintenance of diving equipment.Theoretical training in concepts of physicalchemistry and physiology serving as a basis fordiving theory.The ability to work with a team.A knowledge of rescue and resuscitation.A knowledge of how to drive a motor launch.2.1.2 - Physical trainingTraining to become an experienced swimmer withstandard scuba diving equipment.2.1.3 - Specific theoretical traininga - Knowledge of the French regulations in force inthe field concerned.b - Physics and physiology of diving.Knowledge of the law of physics applicable todiving and to underwater work.Knowledge of the physiological effects ofsubmersion and pressure as well as measurestaken to cope with these.Knowledge of symptoms and emergencyprocedures applicable on site for accidents directlyconnected with diving.c - Safety equipment and regulations.Knowledge of individual equipment used for scubadiving.Compressors, quality criteria, respirable air.Practical organization of a scuba diving operation.d - The holder of a certificate ought in addition topossess a perfect mastery of the use ofdecompression tables for diving and a satisfactoryknowledge of the use of superoxygenatedmixtures. In addition, he or she would know theprinciples and operation of a recompressionchamber as well as the safety rules applicable to it.2.1.4 - Practical traininga - A complete mastery of the methods of

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scuba diving with compressed air down to 12metres for sub class IA and to 40 metres for class Iincluding night diving, diving with no visibility anddiving with the current.Introduction to safe diving without surface access(tunnels, under ice, etc.).b - The role of the rescue diver, mastery of rescuesignals.

2.2 - For Class II

The same criteria as for class I with an extensionof the mastery of safety methods and regulationsat 40 - 60 metres.Rescue diploma (resuscitation option).

2.3 - For Class III

The training objectives are the same as those forclass III, mention A but access to this training is viaclass II, mention B and effective practicalexperience in this class.

B - Training of workers inhyperbaric environments

1 - MENTION C1.1 - For Class I

1.1.1 - General training corresponding tomedical or paramedical practise underhyperbaric conditions.1.1.2 - Specific theoretical training.a - Regulations : knowledge of the relevantregulations (hyperbaric operations, health),b - Physics and physiology of hyperbaricoperations :Knowledge of the rules of physics applicable tohigh pressures.A knowledge of the effects of pressure on man andmeasures to be taken to cope with these.A perfect knowledge of the use of decompressionof the relevant decompression tables.Knowledge of symptoms and correspondingemergency procedures in accidents during periodsunder pressure.

c - Medical principles of high pressures (mainitems),d - Equipment used for high pressure medicine.H.B.O. chambers (hyperbaric oxygen therapy),description, safety rules, type approval.Breathing apparatus (patients/personnel).Medical equipment and its use in high pressures(safety regulations).Fire regulations inside and outside a caisson.Criteria governing the quality of compressed airand mixtures (analyses).1.1.3 - Practical training.a - Preparation, transport and positioning ofpatients.b - Use of breathing apparatus (patients andpersonnel).c - Operation of pressure chamber (compression,decompression, ventilation).d - Knowledge of a compressed air production unit,oxygen circulation and mixtures.e - Use of therapeutic and decompression tables,including breathing of pure oxygen.f - Supervision of patients up to 4 bar.

1.2 - Class II

The same objectives as for class I but, in addition,supervision of persons compressed to six bar.A knowledge of the use by patients of oxygen-nitrogen and oxygen-helium mixtures.

1.3 - Class III

In addition to the training in class II and effectiveworking experience in this class :1.3.1 - Theoretical training.a - Revision of the theory of periods under highpressure with supplementary knowledge on divingin synthetic mixtures :• Constitution,• Manufacturing methods,• Corresponding analyses,• Physiology of high pressures (HPNS),• HPNS symptoms, decompression sickness.

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b - Concepts of decompression and saturationdiving :Knowledge of saturation diving (procedures,parameters),Controls, analytical principles and principles ofatmospheric regeneration.c - Description of equipment in the high pressurediving simulation centre :Pressure chamber, regeneration, gas production,analyzers,Fire safety regulations.d - High pressure medical and physiologicalresearch equipment.

2 - MENTION D2.1 - For Class IA

2.1.1 - Minimum general training correspondingto that for a civil engineering site worker.2.1.2 - Specific theoretical training.Certificate holders in this mention must haveunderstood the following elementary concepts :a - The reasons for work in compressed air,b - A description of the various types of tunnellingmachines with emphasis on what the compressionchamber worker should use in the short term,c - The role of on-site operators, in particular thecompression chamber worker, the air-locksuperintendent (supervising within the meaning ofarticle 31 of the decree), the unit superintendent(head of operations within the meaning of article30 of the decree),d - The composition of the atmosphere and of anypollutants, CO2, CO, dust,e - The definition of pressure units,f - Physical rules governing work under highpressure,g - Description of the risk connected with highpressure working, their symptoms, prevention andcorresponding definitions in particular :Barotrauma,Decompression risks,Quality of respired gas,Value of medical inspections and a

knowledge of the reasons for temporaryincapacity,

• Behaviour following a period under pressure,movements, efforts, journeys by air.

h - Statements on the effects of temperatureconnected with compression and decompression,i - Special precautions to be taken in a hyperbaricenvironment for other harmful effects (from noise,electricity, welding, etc.),j - Behaviour in the case of an accident.2.1.3 - Practical training.This must be given in such a way that thecandidate has been compressed several times to1.2 bar, that he has practised the technique ofpassing through an airlock and has carried outexercises in the evacuation of injured persons andfire fighting and finally that he has a knowledge ofthe procedures for alerting outside operators.

2.2 - For Class I

In addition to the objectives described for class IAof mention D, training shall emphasize problemsconnected with decompression and the resultingrisks and the procedures for their prevention.2.2.1 - Theoretical training.a - Regulations : a knowledge of the regulationsapplicable to underground sites and to work athigh pressures,b - Physics and physiology of high pressureworking :An elementary knowledge of the concepts ofphysics applicable to high pressure working,An understanding of the effects of pressure onman and measures taken to cope with these,Knowledge of the use of relevant decompressiontables, including provisions for successiveoperations and limitations on movement followinga period under high pressure,Knowledge of the symptoms and emergencyprocedures corresponding to accidents duringperiods under pressure, knowledge of treatmentprocedures.

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c - Equipment used for high pressure working onthe site concerned or, in a general way, in airlocksand working chambers in a tunnelling machine andsubmerged pressure chamber :Breathing equipment (rescue or with oxygen,principles, hygiene),Equipment used under pressure, special safetyrules (hydraulics, welding, cutting, explosives,etc.),Fire fighting regulations inside and outside transferairlocks,Criteria governing the quality of compressed airand mixtures (analyses to be carried out in theairlock - colorimetric tubes),Knowledge of rescue and first aid.2.2.2 - Practical training.a - A knowledge of all the components of a highpressure installation, preparation, starting up anairlock, compression procedures,b - Use of breathing apparatus (rescue, and whereappropriate, with use of oxygen),c - Knowledge of the behaviour of the compressionchamber (compression, decompression,ventilation),d - Elementary knowledge of a compressed airproduction unit with, as appropriate, an oxygencircuit,e - Effective compression to 1.2 bar (sub class IA)and 4 bars (class I) : this compression may formpart of tests carries out during the medical fitnessexamination.

2.3 - For Class II

The same objectives but, in addition, effectivecompression to 6 bars.It is imperative to have a knowledge of the role ofoxygen in decompression and the consequencesfor the equipment, as well as a knowledge ofsafety rules.

2.4 - For Class III

In addition to the training in class II :2.4.1 - Theoretical training.a - Revision of the theory concerned with periodsunder high pressure with additional

training in the uses of synthetic mixtures :• Constitution,• Manufacturing methods,• Corresponding analysis,• High pressure physiology (HPNS),• HPNS symptoms, decompression sickness,

b - Concept of decompression and saturationdiving :• Knowledge of the method of saturation diving

(procedures, parameters),• Controls, analytical principles and principles of

atmospheric regeneration,c - Principle of transfers under pressure :• Compression chamber, diving bell,

regeneration, gas production, analysers,• Individual gas recovery equipment,• Vessels with dynamic positioning,• Evacuation under high pressure,• Fire safety regulations,• Adaptation where necessary of these

principles to work in a tunnelling machine,d - Appropriate regulations. Knowledge of rulesapplicable abroad.2.4.2 - Practical training.The necessary experience to carry out thefollowing operations in safety and undersupervision :a - Operations with saturation at pressures greaterthan 10 bars,b - Monitoring of saturation :• Analysis,• Regeneration,

c - Knowledge of the manufacture of mixtures,d - Use of high pressure equipment,e - Keeping of documents associated with highpressure operations.

ANNEX IIILIST OF DIPLOMAS REFERRED TO INARTICLE 2 OF THE PRESENT DECREE

For categories Aa - Diving diplomasDiving certificate level 4 awarded by members ofthe Consultative Committee for Diving Education.

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State sports instructor certificates, underwaterdiving option ;Civil safety certificates in the use of light scubadiving equipment (40) ;SAF Land Forces certificate CT2 ;Ship’s diver’s certificate (mention 40) of theNational Navy.b - Professional diving diploma.Diver’s classification certificate in application ofdecree n°74-725 of 11th July 1974 ;CETRAVIM diver’s diploma ;I.N.P.P. diver’s diploma ;SOGETRAM diver’s diploma ;C.G. DORIS diver’s certificate ;Equivalent foreign diplomas subject to additionaltraining on French Regulations, in particular :Part I, Part II certificate issued by the Health andSafety Executive (HSE) ;Bell diver certificate or Air Diver certificate issuedby the Norwegian Petroleum Directorate (NPD).

For mention B

a - Non-professional diving diplomas.Diving certificate level 4 ;Civil safety certificate for diving with light scubadiving equipment (40) ;

SAF Land Forces certificate CT2 ;Ship’s diver’s certificate (mention 40) of theNational Navy.b - Professional diving diplomas.Corresponding I.N.P.P. certificates, obtainedbefore 1st October 1990 ;State sports instructor certificate, 1st degree (divermention) ;Head of Scientific Diving Diploma of the C.N.R.S.

For mention C

I.N.P.P. certificate, Pressure Diver mentionobtained before 1st October 1990.Diplomas in the medicine of high pressures fromthe universities of :Paris VMarseilleAix-MarseilleToulouseLilleBordeauxStrasbourg.

For mention D

Corresponding I.N.P.P. certificates obtained before1st October 1990.

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FRENCH GOVERNMENT

DECREE OF 28th MARCH 1991Defining recommendations to medical doctors responsible for the medicalsupervision of workers operating in a hyperbaric environment

ARRÊTE DU 28 MARS 1991Définissant les recommandations aux médecins de travail chargés de lasurveillance médicale des travailleurs intervenant en milieu hyperbare

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DECREE OF 28th MARCH 1991defining recommendations to medical doctors

responsible for the medical supervision of workersoperating in a hyperbaric environment

The Minister of Employment, Labour andOccupational Training, the Minister of Agricultureand Forestry and the Minister responsible for theSea,As proposed by the Director of Labour Relations,In consideration of the Labour Code, in particularitems L. 241-1 and R. 241-48 to R. 241-57 ;In consideration of decree n°90-277 of 28th March1990 relating to the protection of workers operatingin a hyperbaric environment and notably its articles33, 34 and 35 ;In consideration of the decree of 28th January 1991defining the procedures for safety training ofpersonnel operating in a hyperbaric environment ;In consideration of the advice of the NationalCommittee for Health and Safety at Work inAgriculture ;In consideration of the advice of the Council for thePrevention of Occupational risks,Decree :

Article 1

The annex to the present decree states therecommendations to medical doctors carrying outmedical supervision as specified in articles 33, 34and 35 of the decree of 28th March 1990 referred toabove and gives a list of supplementaryspecialized examinations.

Article 2

The decree of 4th October 1974 laying down theterms for recommendations to doctors carrying outthe medical supervision specified by decree n°74-725 of 11th July 1974 relating to special protectionmeasures applicable on sites or establishments inwhich work is carried out by divers underpressures greater than atmospheric pressure, isrepealed.

Article 3

The Director of Labour Relations, the Director ofOperations, Political Social Policy and Employmentand the Director of Seafarers and of GeneralAdministration are made responsible, as itconcerns each of them, for the implementation ofthe present decree, which will be published in theJournal Officiel of the French Republic.

Issued in Paris, 28th March 1991.

The Minister of Employment,Labour and Occupational Training,For and on behalf of the Minister :The Director of Labour Relations,O. DUTHEILLET DE LAMOTHE

The Minister of Agriculture and Forestry,For and on behalf of the Minister :In the absence of the Director of Operations,social policy and employment :The Director for Unclassified Labour,F. PANTALONI

The Minister responsible for the Sea,For and on behalf of the Minister :The Director of Seafarers andGeneral Administration,A BOROWSKI

ANNEX

Procedures for medical supervision of workersin a hyperbaric environment

The decree of the 28th March 1990 states thatworkers operating in a hyperbaric environmentmust benefit from special medical supervisionbased on a general clinical examination and onsupplementary specialized examinations.

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By virtue of article 33, 34 and 35 of theaforementioned decree, this supervision must becarried out :Before work in a hyperbaric environment,Then, every six months or every year according towhether the workers concerned are more or lessthan 40 years old,And when any high pressure incident or accidenttakes place.It must in addition by repeated when the workerreports that he is indisposed by virtue of the workhe has carried out.Medical supervision shall aim at determining themedical fitness of workers operating in ahyperbaric environment, adapting it wherenecessary, and taking account of activities actuallycarried out, of the conditions, of recommendationsor of formal contra-indications.For this purpose, it will be necessary :On the one hand, to reveal pre-existing anomaliesor factors liable to aggravate the effects of highpressure working on health,And on the other hand, to detect early stages ofillness which are still reversible.Research into these pathological conditions whichmay be present, which are more oftenasymptomatic and noted in young people, shall bejustified by the nature of the risk which areattributable to the environment in which the workerhas been required to spend his time.It is for this reason that, although the prescribedexaminations should obviously take account of thevarious factors in the high pressure situation whichare liable to cause accidents and particular risks ofbarotrauma, as well as those due todecompression or to an increase in respiratoryresistance, the fact should not be neglected thatthe worker is called upon to adapt his behaviour toan essentially hostile environment in which certainof his functions may be altered or adverselyaffected to the point where he is not in a position,under certain circumstances, to ensure hissurvival.Thus it will be necessary to investigate

pathological conditions carefully which are liable tobring about loss of consciousness or considerableincreases in heart rate associated with intenselylaboured breathing.Finally, it is necessary to emphasize that forexposure to a relative pressure greater than26,000 hectopascals (26 bars), additionalexaminations must be carried out with regard tothose referred to in 1 and 2 below, in particularneurophysical and vestibular examinations.

CONDUCT OF MEDICAL SUPERVISION ANDLIST OF EXAMINATIONS

1 - Medical examinations for workers holding acertificate of competence in high

pressure working in categories A, B or C

The categories A, B and C are those defined inarticle 1 of the decree of 28th January 1991referred to above relating to training procedures forpersonnel operating in a hyperbaric environment :• Mention A : Diving activities,• Mention B : Other underwater activities,• Mention C : Activities of hyperbaric medical

officer.

1.1 - Examination prior to the first assignmentto a hyperbaric environment

Whatever the class to which he has access, theworker must, prior to this first assignment to ahyperbaric environment, be subjected to acomplete clinical examination and at least thefollowing supplementary examinations :• An exploratory examination of respiratory

function comprising in particular a measure ofvital capacity, forced expiratory volume for thefirst second, maximum breathing capacity perminute, a flow-volume curve for the maximumoxygen consumption by an indirect method,

• An electrocardiogram (12 leads) at rest andduring a test at below maximum effort on anergometric bicycle,

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An audiogram with impedance measurement,An electroencephalogram with intermittent lightstimulation and hyperpnoea,A biological examination comprising in particular ablood count, blood sugar level, examination foruricaemia, total cholesterol determination,triglyceride determination and a test for albuminand blood in the urine,A radiographic examination comprising atelethorax, an x-ray of the large joints (hips andshoulders from the front, knees from the side witha lower third of the femur and an upper third of thetibia),A compression test in a pressure chamber at arate of between 300 hectopascals (0.3 bar) and3,000 hectopascals (3 bars) per minute up to aminimum relative pressure of 1,200 hectopascals(1.2 bar).As a general rule, the compression test in apressure chamber and the electroencephalogramwill not be carried out again during periodicexaminations.As a general rule, the initial medical examinationmust be carried out again for any worker, whoduring four consecutive years, has not carried outany work under pressure and therefore has notbeen subjected to a periodical medicalexamination.

1.2 - Annual medical examination

Whatever the class to which the worker hasaccess, the annual periodic examination shallcomprise a clinical examination and certainsupplementary examinations carried out prior toassignment, particularly an exploration ofrespiratory function, an audiogram, anelectrocardiogram at rest and with a test at belowmaximum effort and a biological examination.On the other hand, an x-ray of the large joints shallonly be carried every four years, except in thecase of an anomaly.

1.3 - Half-yearly examination

For workers who are more than forty years old, thehalf-yearly examination shall comprise a clinicalexamination, with an addition if necessary, ofsupplementary examinations.

2 - Periodical examinations for workerswho hold a certificate of competence inhigh pressure operations in Mention D

(other than medical high pressure workers)

2.1 - For workers in high pressure who are holdersof the certificate of competence in high pressureoperations, carrying a mention D and belonging toclasses I B, II and III as defined in article 3 of thedecree of 28th March 1990 referred to above,special medical monitoring shall be carried out inaccordance with the recommendations given in 1above.

2.2 - For high pressure workers belonging to classI A, that is to say for those for which the relativeoperating pressure will in all circumstances be lessthan 1,200 hectopascal (1.2 bar), medicalsupervision shall be identical in principle to thatdefined in 1 above, but the electroencephalogram,the effort test under below maximum conditions,during the electrocardiogram, and x-rayexaminations of the knee will not be required.Figures for the systolic and diastolic pressuresgreater than those specified in 3.3 below, will beaccepted according to the discretion of thecompany diving medical doctor.As regards the reduction in hearing measured inair, the provisions of 3.5 below are not required ;however, the overall reduction in hearing of oneear should not exceed that of the other ear bymore than 35 dB.

3 - Recommendations on fitness conditions

In the course of periodical inspections, the fitnesscriteria listed below must be assessed case bycase by the company diving medical

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doctor as a function of the age of the worker, hisexperience in high pressure working and of coursethe locality in which he is required to work.

3.1 - Morphology

Obvious excess weight should be considered as acontra-indication to exposure to a high pressureenvironment.

3.2 - Respiratory system

Any clinical, anatomical, radiological or functionalanomaly shall call for a specialized examination tobe carried out.The results of the exploration of respiratoryfunction shall be evaluated with respect to the1983 C.E.C.A. standard ; the lower limit to be takenas a measure of fitness shall be represented bythe C.E.C.A. standard x 0.8.In the adaptation test at less than maximum effort,the maximum oxygen consumption determinedwith the aid of the Astrand monogramme must begreater than or equal to 40 millimetres per minuteand per kilogramme.As a general rule, the medical doctor should inparticular consider the following as factors to beconsidered as contra-indications to exposure to ahyperbaric environment.A Tiffeneau index less than 70 %,Evolutive asthma,After-effects of thoracotomy,After-effects of a pulmonary abscess,A history of spontaneous pneumothorax,Functional after-effects of a pleural infection,After-effects of tuberculosis,Emphysema.

3.3 - Cardio-vascular system

On entry to the profession and apart from anytreatment, the systolic arterial pressure must beequal to or less than 150 mm of mercury and thediastolic pressure shall be equal to or less than 90mm.

Any clinical, anatomical or functional anomaly ofthe cardio-vascular system, in particular of theright-left communications, shall call for aspecialized examination in order to evaluatefitness.

3.4 - Digestive system

As a general rule, the diving medical doctor shouldin particular consider as factors constituting acontra-indication to exposure to a hyperbaricenvironment, all pathological digestive processesliable to be recurrent and to involve acutecomplications, such as evolutive gastroduodenalulcer, diverticulosis or chronic deterioration of thehepatic metabolism.For saturation operations, it is advised that thesebe carried out by workers who have undergoneappendicectomy.

3.5 - Ear nose and throat conditions

As a general rule, the diving medical doctor shouldin particular consider as factors constituting contra-indications to exposure to a hyperbaricenvironment as follows :• Ostopongiosis,• Laryngocele,• Chronic otitis or sinusitis,• Lack of initial hearing for each ear exceeding,

in tonal audiometry, a value of 25 dBcalculated from air conduction curves for thefrequencies 500, 1,200, 2,000 and 4,000 Hertzin accordance with the weighting rule definedin table 42 of general regulations foroccupational diseases.

However, in the course of his career, a workerexhibiting a loss of hearing greater than this limitmay be allowed to remain in his place of work in ahyperbaric environment if a vocal audiometry testreveals an intelligibility curve judged to becompatible with his work, that is to say, a curvehaving a normal trend whose slope is sufficient for100 % intelligibility to be reached at 60 dB and adeficit at a threshold of 50 % not exceeding 40 dB.

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3.6 - Ophthalmology

Official acuity without correction, colour perceptionand field of vision must be compatible with the typeof occupational activities and the assignmentsgiven to the worker in a hyperbaric environment.As a general rule, the diving medical doctor shouldin particular consider as factors constituting acontra-indication to exposure to a hyperbaricenvironment as follows :Detached retina, even one which has beenoperated on,An intra ocular operation scar,Glaucoma, even open angle,Keratoconus.

3.7 - Neurology

Operations in a hyperbaric environment requireperfect anatomical and functional integrity of thenervous system. It is for this reason that anyclinical anomaly which is noted shall call for thecarrying out of a specialized examination.As a general rule, the diving medical doctor shouldin particular consider the following as factorsconstituting a contra-indication to exposure to ahyperbaric environment :Symptoms of epileptic disorders,Previous cranial traumatism, for closed cranialtraumatism, it will be necessary to ensure thebenign nature of the accident or the absence ofafter-effects,After-effects of meningo-encephalic illness,Degenerative neuro-muscular diseases,After-effects of an infectious or traumatic medullarycondition.

3.8 - Psychopathology

Questioning during a clinical examination carriedout by the diving medical doctor, should enableany behavioural difficulties to be revealed, which, ifthey were to become apparent in a hyperbaricenvironment, would

have dramatic consequences on the worker or onthose around him.Thus, lack of adaptability of response, signs ofbradypsychia should cause the diving medicaldoctor to carry out supplementary investigations.The existence of serious neuropsychiatric conflictsassociated with significant psychosomaticreactions shall be, under any circumstances,sufficient to justify a declaration of unfitness.

3.9 - Electroencephalographicexamination (E.E.G.)

As a general rule, the diving medical doctor shouldin particular consider the following as factorsconstituting a contra-indication to exposure to ahyperbaric environment :• Electroencephalographic signs indicating

epilepsy, whether these are spontaneous orproduced by intermittent light stimulation or byhyperpnoea,

• Focal signs of a cerebral malady,• Diffuse or persistence monomorphic or

polymorphic theta or delta activities occurringin a subject who is alert or resting,

• Observation of an alpha-like backgroundrhythm with a frequency of less than 7.5 Hertzor the existence of asymmetry in the alpharhythm frequency between the twohemispheres, greater than 1.5 Hertz.

The diving medical doctor shall not systematicallyconsider the following as being factors constitutingcontra-indications to exposure to a hyperbaricenvironment :• A slow alpha rhythm,• Non-synchronized traces,• The observation of slow posterior functional

waves in the absence of clinicalsymptomatology,

• The observation of symmetrical pariero-occipital paroxysms with intermittent lightstimulation, if they are generalized and withoutany clinical effects,

• The observation of symmetrical

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anterior delta synchronization after three minutesof hyperpnoea thoroughly carried out with asubject less than 30 years old.

3.10 - Locomotory system

As a general rule, the diving medical doctor shall inparticular consider as factors constituting contra-indications to exposure to a hyperbaricenvironment, the observation of an anomaly in thelocomotory system involving significant functionalimpairment.Before the first assignment, observation ofosteonecrosis could involve a declaration ofunfitness ; consequently, the occurrence of juxta-articular dysbaric osteonecrosis should be thesubject of continuous supervision.

3.11 - Dermatology

The diving medical doctor shall only considerchronic skin conditions as factors constitutingcontra-indications to exposure to a hyperbaricenvironment if they originate in functionaldisorders.

3.12 - Haematopoietic organs

As a general rule, the diving medical doctor shouldin particular consider the following as factorsconstituting a contra-indication to exposure to ahyperbaric environment :Abnormal blood crasis,

• Sickle cell anaemia,• Enlarged spleen or spleenectomy with

retention on the blood count.

3.13 - Stomatology

For persons holding a certificate bearing thecategories A and B, the condition of the bucklecavity and of the teeth should be such as to enablethem to use a breathing apparatus with amouthpiece.

3.14 - Genito-urinary system

An involutive condition may constitute atemporary or final contra-indication seeing that theoccurrence of acute episodes (urinary lithiasis)may put the safety of the worker in danger onaccount of the hyperbaric context.

3.15 - Pregnancy

Pregnancy shall constitute a contra-indication towork in a hyperbaric environment. The divingmedical doctor ought in this respect to remindwomen of childbearing age of the benefit for themand for the child of reporting their pregnancy at anearly stage.

3.16 - Metabolic disorders

Any severe metabolic disorder shall constitute acontra-indication, notably diabetes mellitus.

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FRENCH GOVERNMENT

DECREE OF 20th AUGUST 1991prescribing the conditions under which a derogation may be granted asregards the age limit for applying for a certificate of competence inhyperbaric operations

ARRÊTE DU 20 AOUT 1991fixant les conditions de dérogation à l’âge limite pour postuler au certificatd’aptitude à l’hyperbarie

Journal officiel of the French Republic30th August 1991, page 21

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DECREE OF 20th AUGUST 1991prescribing the conditions under which a derogation may

be granted as regards the age limit for applying for acertificate of competence in hyperbaric operations

Journal Officiel of the French Republic 30th August 1991

The Minister of Agriculture and Forestry, theMinister for Employment, Labour and OccupationalTraining and the Secretary of State for the Sea,In consideration of the Labour Code,In consideration of Decree n°90-277 of 28th March1990 relating to the protection of workers operatingin a hyperbaric environment and in particular itsarticle 4,In consideration of the decree of 28th January 1991defining the procedures for safety training ofpersonnel taking part in hyperbaric operations,In consideration of the decree of 28th January 1991defining recommendations to doctors responsiblefor the medical supervision of workers operating ina hyperbaric environment,In consideration of the advice given by the NationalCommittee for Health and Safety at Work inAgriculture dated 28th June 1991,In consideration of the advice given by the Councilfor the Prevention of Occupational Risks(Chemical, Biological and Physical environmentalRisks Committee) dated the 19th June 1991,As proposed by the Director of Labour Relations,by the Director of Operations, Social Policy andEmployment and of the Director for Seafarers andGeneral Administration,

Decree :

Article 1

In derogation of the provisions of article 4 of

the decree of 28th March 1990 referred to above,the age limit for applying for the first time for acertificate of competence in hyperbaric operationsin classes I and II for categories C and D defined inarticle 1 of thedecree of 28th January 1991 referred to above,shall be extended to 55, subject to the medicalfitness of the applicants.

Article 2

The present decree shall be published in theJournal Officiel of The French Republic.

Issued in Paris, 20th August 1991.

The Minister of Employment,Labour and Occupational Training,For and on behalf of the Minister :In the absence of the Directorof Labour Relations :The Assistant Director ofLabour ConditionsF. BRUN

The Minister of Agriculture and Forestry,For and on behalf of the Minister :In the absence of the Director of Operations,social policy and employment :The Head of DepartmentJ. LENOIR

The Secretary of State for the Sea,For and on behalf ofthe Secretary of StateThe Director of Seafarersand General Administration,A. BOROWSKI

Translator’s notes :

1) Translation number 14760 refers to sections numbered 10 and 12 in the annexes but in fact the textsent to me ends at 4.4 of Annex II.

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FRENCH GOVERNMENT

DECREE OF 15th MAY 1992defining procedures to be used in a hyperbaric environment, as regardsaccess, work duration, evacuation and organization of work.

ARRÊTE DU 15 MAI 1992définissant les procédures d’accès, de séjour, de sortie et d’organisationdu travail en milieu hyperbare

Journal Officiel of the French Republic26th June 1992, pp 23-38

ANNEXE I - Definitions

ANNEXE II - Procedures for diving operations with compressed air or with anitrogen-based mixture

ANNEXE III - Procedures for diving operations with mixed gas with heliumbased

ANNEXE IV - Procedures with compressed air without diving according tothe mention C activity

ANNEXE V - Procedures with compressed air without diving according tomention D activity

ANNEXE VI - Procedures of urgent recompression

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DECREE OF 15th MAY 1992defining procedures to be used in a hyperbaric environment,

as regards access, work duration, evacuationand organization of work

The Minister of Labour, Employment andOccupational Training, the Minister of Agricultureand Forestry and the Secretary of State for theSea,In consideration of the Labour Code,In consideration of decree n°90-277 of 28th March1990 relating to the protection of workers in ahyperbaric environment, and in particular itsarticles 6, 8, 9, 23 and 32,In consideration of the decree of 28th January 1991defining procedure governing the safety training ofpersonnel taking part in hyperbaric operations,In consideration of the advice given by the NationalCommittee for Health and Safety in AgriculturalWork,In consideration of the advice given by the Councilfor the Prevention of Occupational Risks,

Decree :

Article 1

The object of the present decree is to defineprocedures to be used in a hyperbaricenvironment as regards access, work duration,evacuation and work organization, intended toguarantee the health and safety of workers inrelation to available decompression methods andtables.The technical terms or expressions used for theapplication of the present are defined on Annex I.

SECTION 1OPERATING PROCEDURES IN AN

UNDERWATER ENVIRONMENTCHAPTER I

Duration of stayArticle 2

Except in the case of saturation diving oremergency dives resulting from circumstances

which endanger human life and taking into accountthe provisions or article 3 below, the daily period inthe water in the course of one or more dives, maynot be greater than 3 hours. The decompressiontime in water must be consistent with theevaluation of the duration of submersion.This duration may however be extended to sixhours a day for an operation, comprising wherenecessary a successive dive, which does notrequire decompression stops if the activity carriedout in a underwater environment corresponds tothat associated with mention B defined in article 1of the decree of 28th January 1991 referred toabove.

Article 3

Except when appropriate protection is used, thedaily duration in the water laid down in the firstparagraph of article 2 above, should be reducedwhen work is carried out in a strong swell or in acurrent.The daily length of time in the water should also bereduced when the temperature of the water is lessthan 10°C or greater than 30°C and when thediving clothes used do not ensure satisfactorythermal comfort.In addition, the daily duration may not exceed 90minutes when pneumatic percussion tools areused having a mass greater than 20 kilogrammes.

Article 4

The duration of operations carried out duringsaturation diving shall be evaluated between theunclamping and clamping phase of the pressurechamber, diving bell or diver-carrying submersible,from which the underwater operation is carried out.This duration may not exceed eight hours, it beingunderstood that the effective time in the water isnot extended beyond seven hours.

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The length of time at saturation counting from thestart of compression until the return to atmosphericpressure may not exceed 30 days. In addition, thenumber of days of saturation, per twelve monthperiod, may not exceed 100 including compressionand decompression.The interval between two periods of saturationmust be a period which is at least equal to that ofthe first of the two saturation periods, includingcompression and decompression.

CHAPTER IIConditions governing various

diving methodsArticle 5

I - Scuba diving may only be carried out for relativepressures less than 6,000 hPa (6 bars).The official inspector or local officer in charge ofmaritime affairs may however authorize scubadiving operations at pressures greater than 6,000hPa (6 bars) as soon as he has verified that theconditions under which these operations arecarried out ensure that the workers concernedhave protection which is equivalent to that in a divecarried out at lower pressure.II - In addition to the diving suit which must complywith the standards in force and must be providedwith a reserve gas system or a pressure control onone or more cylinders, the worker must beprovided with specific individual equipment whichwill enable the various diving parameters to becontrolled and his thermal equilibrium to bemaintained and will enable him to move aboutwithout any impediment and to reach the surface incase of emergency.When the relative operating pressure is greaterthan 1,200 hPa (1.2 bar) or when the depth of theoperations site is not absolutely known by thesupervisor present at the control post, a devicemeasuring the depth of the work site must beinstalled on the surface.III - The person designated to provide assistanceto the submerged diver shall be provided withappropriate equipment and

shall be ready to intervene. He should hold acertificate of competence in high pressureoperations consistent with the depth and means ofdiving used for rescue.If the diver is permanently physically connected tothe surface, the diving team need only comprisethree persons.If, on the contrary, the diver is not permanentlyphysically connected to the surface, the diveshould be carried out in pairs, so that divers mayprovide mutual assistance. Under theseconditions, the minimum diving team shall consistof four persons.As regards naval supply firms, the make-up of thediving team shall be defined by a decree from theMinister Responsible for the Sea.IV - A launch and a means of exit from the waterfor a unconscious diver must be provided in theimmediate proximity of the diving site.In addition, when diving necessitatesdecompression stops in the water, a lazy shot ropemust be provided which will enable the diver toidentify the depth at which he must carry out hisdecompression stops.V - In the case of diving in a tunnel, when theprovisions of III above cannot be applied, specificsafety means must be put into place and thepersonnel concerned must have receivedappropriate training.

Article 6

I - Except in the case where assistance needs tobe given to persons in danger, surface supplieddiving may only be carried out for relativepressures of less than 6,000 hPa (6 bars).II - In addition to an umbilical, a safety harnessnecessary for anchoring the diver and specificindividual equipment enabling the worker to controlthe various diving parameters, to maintain histhermal equilibrium, to communicate with thesurface and to move about without impediment, thediver must be provided with a self containedbreathing gas reserve in order to be able, in

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case of emergency, to reach the surface oranother source of gas supply, taking into accountany decompression stops.In addition, a gas reserve must be available on thesurface in case of any failure in the main supply.If diving is carried out with a system of heating withlost hot water, a standby means for supplying hotwater must be provided to enable the diver toreturn to the surface, taking into account thenecessary decompression time.A launch and a means of exit from the water for anunconscious diver must be available in theimmediate proximity to the diving site.When diving necessitates decompressions stopsin water, a lazy shot must be provided enabling thediving to identify the depth at which he must carryout his decompression stops.III - The person who is able to provide assistanceto the submerged diver must hold a certificate ofcompetence in high pressure working compatiblewith the depth and the diving equipment used forrescue ; in the event where a rescue operation isprovided with scuba diving, means must beinstalled for connecting the equipment surface andfor establishing communications.IV - The minimum team necessary to ensuresurface-supplied diving by one or two divers shallinclude, on the surface, at least onesuperintendent of high pressure operations whoshall simultaneously provide supervision, assistedby a rescue diver. Under these conditions, theteam shall comprise three or four persons,according to the case.In addition to two divers in the water, the teamshould comprise an additional assistant on thesurface per additional submerged diver.

Article 7

I - The method of diving in an open wet bell maynot be put into operation unless the relativeoperating pressure is less than 9,000 hPa (9 bars)and unless the pressure inside the open wet bellduring decompression stops,

can be stabilized with a precision of 50 hPa (0.05bar).When a diver, who is carrying out adecompression process in an open wet bell withpure oxygen, has not completely emerged, it willbe considered, for the purpose of evaluating theperiod in water and for choosing the permittedpartial pressures of oxygen, that he has left thewater only if there are two divers in the open wetbell and he is secured in such a way that his headcannot be submerged.When divers are out of the water for thedecompression period, the total duration of thehigh pressure operation shall be arranged so thatthe period of decompression shall not exceed 200minutes. If the open wet bell is only used to carryout decompression, supply and monitoring of thediver may be carried out according to the hookahdiving method.This supply method shall be compulsory when theopen wet bell is used on a site where the depth isvery much greater than that of the working level,so as to counter any rupture of the suspensioncable. In addition, a safety hawser must beconnected to the open wet bell.II - The open wet bell must be equipped with a gasreserve enabling pressurization and evacuationfrom the water to be carried out, using mixturewhich can be breathed at depth by divers. Ifbreathing of pure oxygen is provided in the openwet bell, this oxygen shall be stored on board thebell and distributed by means of breathingapparatus provided with a device, such as a vent,for discarding gas to the outside. This oxygencircuit must be marked, installed and degreased inaccordance with the piping standards in force.On the surface, the diving control post must beable to monitor the various submersion parametersof the open wet bell and the diver at the same time,in particular parameters relating to the supplypressure for the umbilical of the open wet bell, ifthe latter is independent of the supply of the diveror divers.

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The handling system and the system for loweringinto the water must comply with the regulationsrelating to lifting equipment for two persons.III - Apart from the head of hyperbaric operations,the surface supervisor and the rescue diverspecified in article 30 and 31 of the decree of 28th

March 1990 referred to above, the team necessaryfor putting into operation the method of diving in anopen wet bell must comprise one person in chargeof the handling of the bell and one personcontrolling the umbilical, except when the latter ishandled mechanically. Under these conditions, ifthe head of hyperbaric operations can himselfensure continual supervision on the surface, theteam necessary for operating open wet bell divingshall comprise at least five persons.

Article 8

I - Diving with a system shall be compulsory assoon as the relative operating pressure exceeds9,000 hPa (9 bars) or when the decompressionperiod is greater than 200 minutes.II - A team in a bell or a diver-carrying submersibleshall consist of at least two divers, one of thembeing in charge of the bell. During the hyperbaricoperation, the diver in charge of the bell must bepresent in the bell or the hyperbaric compartmentof the diver-carrying submersible and becontinually equipped for providing assistance tothe other diver.On the surface, in addition to the head ofhyperbaric operations, the surface supervisor andthe rescue diver, the team must include personnelnecessary for the satisfactory operation andhandling of the diving system.In addition, when diving necessitates a period in acompression chamber greater than twelveconsecutive hours, the team shall besupplemented in order to ensure continualoperation of the installation.

CHAPTER IIIPreparation for operations

Article 9

Prior to any hyperbaric operation in an underwaterenvironment, the head of operations must carry outa reconnaissance of the site, he must organize thesite’s installations and buoying where necessary(markers, flags, notice to sailors) and must markout the site limits.For each dive, the reserves and composition ofgas mixtures to be used must be checked as wellas the presence of necessary individual andcollective equipment, the layout of circuits and thesatisfactory operation of all methods of operation,in particular those relating to safety.

CHAPTER IVDecompression procedures and tables

Article 10

Under normal conditions of operating incompressed air, decompression of divers must becarried out in accordance with the procedures andtables described in annex II of the present decree,and for operations with heliox mixtures, inaccordance with those described in annex III.Taking into account the actual or equivalent depthat which operations are taking place, the intendeddiving method and the correspondingdecompression procedure, the head of hyperbaricoperations must, under the responsibility of theemployer, select the most appropriatedecompression table from among those publishedin the annexes in order to guarantee the healthand safety of divers.

Article 11

In accordance with the requirements of article 29of the decree of the 28th March 1990 referred toabove, the employer or the head of hyperbaricoperations under his responsibility

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must, prior to any diving operation, provideworkers concerned with a site document definingthe methods, normal procedures and safetyprocedures relating to diving and, in particular,decompression tables.In addition, a diving record sheet shall be attachedto this site document to be filled in for eachoperation.The following should appear on this diving recordsheet :The date,The names of divers and of the surface supervisor,The successive diving intervals of diving,The names of the rescue diver and of personnelproviding assistance,The diving locality,The maximum depth of operations,The time at which submersion takes place,The time at which decompression starts,The type of breathing apparatus and the nature ofmixtures used,The decompression procedure used as well as thenature of the breathing gas,The time at the end of decompression,The altitude,Physical and atmospheric diving conditions suchas the speed of current, visibility, the condition ofthe sea or the temperature.The diving record sheet must be completed as theoperation proceeds, mentioning all incidents.

Article 12

Changes and extrapolations to decompressiontables are forbidden.When operating with scuba equipment, diversmust have decompression tables availablecorresponding to the diving in which they areengaged.

SECTION IIHYPERBARIC OPERATING

PROCEDURES WITHOUT SUBMERSIONArticle 13

The duration of work in compressed air must notexceed six hours a day, including compressionand decompression times. It may however reacheight hours a day when the relative workingpressure is less than or equal to 750 hPa (0.75bar).For relative working pressures less than 750 hPa(0.75 bar) no decompression stops are to becarried out.In derogation from the provisions of the firstparagraph above, on the occasion of emergencyrecompressions and of treatment fordecompression accidents or for pulmonary excesspressure, the accompanying personnel mayremain under pressure during all the period oftreatment.

Article 14

Except in the case of emergency recompression,decompression tables and procedures to beemployed during operations without submersionare those described in annexes IV and V of thepresent decree.For operations at operating pressures greater than4,800 hPa (4.8 bars) without saturation, theprocedures followed must be the subject of priorauthorization from the Minister responsible forLabour or Agriculture or the Sea.

Article 15

For saturation operations, the procedures to beused are those described in annex III of thepresent decree.

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SECTION IIIPREVENTIVE AND EMERGENCY

MEASURESArticle 16

The interval to observed following the end of ahyperbaric operation, before being subjected to anambient pressure significantly lower than normalpressure in the operating locality, particularly onthe occasion of journeys by air, is given, as afunction of the various types of operation and ofthe possible variations in pressure or altitude, bythe following table :

1991 referred to above, the pressure chambermust be situated on site if the operating pressurewhich is provided exceeds 1,800 hPa (1.8 bar).

Article 18

In cases of symptoms following a decompressionaccident, the diving medical doctor shall bealerted. In addition the worker who is victim of theaccident must be recompressed with anaccompanying person who holds a certificate ofcompetence in hyperbaric operationsaccording to the

VARIATION IN PRESSUREor altitude

emergency procedures described in annex VI ofthe present decree.

TYPE OF OPERATIONGreater than

500 m(approx.50 hPa)

Greater than2,600 m

or flight in acommercial

aircraft(approx.250 hPa)

SECTION IVFINAL PROVISIONS

Article 19

Compressed air withoutstops

2 hours 4 hours When the saturation diving exceeds the limitsdefined in the annex, the Minister responsible

Compressed air or helioxwith stops

12 hours 12 hours for Labour must be informed of the procedureprovided. The same applies if on this occasion

Heliox saturation 12 hours 12 hours the density should exceed 9 g/l or if theEmergency recompression 24 hours 48 hours saturation period must be greater than 30

Article 17

If the period of time specified between the alarmand arrival in the recompression chamber isgreater than one hour, the total duration of stopsmust be less than fifteen minutes.For activities corresponding to mention B laid downin article 1 of the decree of 28th January 1991referred to above, the employer must specify, inthe manual of hyperbaric operations, the safetymeasures put into effect in relation to theavailability of the emergency recompressionchamber. In the case of evacuation by air withoutpressurization, the journey must be carried out atan altitude 300 m above that of the diving location.For activities corresponding to mention D laiddown in article 1 of the decree of 28th January

If the operating conditions are such that certainequipment specified by the present decree is ofitself a source of risk or are such that by reason ofexceptional circumstances connected with thenature of the operation, notably in a tunnel, thepressure limits for various methods, the maximumexposure periods or the specified decompressiontables and procedures prove to be unsuitable oreven dangerous, other methods or otherequipment may be used when these offer betterguarantees of safety for the operation concerned,and when the personnel has received appropriatetraining and the employer has been previouslyauthorized to put them into action by the Ministerresponsible for Labour Agriculture or the Sea.

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Article 20

The Director of Employment and Labour Relations,the Director of Operations, Social Policy andEmployment and the Director of Seafarers andGeneral Administration are made responsible, as itconcerns each of these, for the implementation ofthe present decree, which will be published in theJournal Officiel of the French Republic.

Issued in Paris, 15th May 1992.

The Minister of Labour, Employmentand Occupational Training,For and on behalf of Directorof Labour Relations,O. DUTHEILLET DE LAMOTHE

The Minister of Agriculture and Forestry,For and on behalf of the Director of Operations,Social Policy and Employment,H.-P. CULAUD

The Secretary of State for the Sea,For and on behalf ofthe Secretary of State :The Director of Seafarersand General Administration,A. BOROWSKI

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ANNEX I

DEFINITIONS

1 - PERSONNEL

Any person operating at pressures greater thanatmospheric pressure, within the meaning ofArticle 1 of the Decree of 28th March 1990 referredto above.

Diver

Any person operating in an underwaterenvironment and subjected to a pressure greaterthan atmospheric pressure.

High pressure worker or hyperbaric worker

Any person operating without submersion in anenvironment at a pressure greater thanatmospheric pressure.

Surface supervisor (article 31 of the decree of28th March 1990)

Designated by the employer or his representativeon the site, he is, at atmospheric pressure,responsible exclusively for ensuring the safety ofpersons operating under pressure until they returnto atmospheric operations.

Head of hyperbaric operations (article 30 ofdecree of 28th March 1990)

Designated by the employer to represent him onsite, he supervises all hyperbaric operations.

Pressure chamber superintendent/air locksuperintendent

The pressure chamber superintendent or air locksuperintendent is a technician, whether a diver ornot, capable of ensuring the maintenance andoperation of hyperbaric

chambers and transfer air locks. He checks, andcauses to be applied, procedures involving the useof the pressure chamber or air locks under theresponsibility of the head of hyperbaric operations,and then holds the post of supervisor.

Bell supervisor

The bell supervisor is the diver who is responsiblefor controlling the bell during operations. Hecarries out the functions of rescue diver.

Surface assistant

Any person, whether or not a diver, who assiststhe head of hyperbaric operations on the surface(sailor, hoist operator, technician, etc.).

Rescue diver or hyperbaric worker (article 31,2nd paragraph of the decree of 28th March 1990)

Diver or hyperbaric worker not taking part directlyin work in progress but remaining in a state of alertand immediately ready to assist any submerged orcompressed personnel in difficulty. He must be theholder of a certificate in hyperbaric operationsrequired for the activities in hand.In the case of diving with system, this function shallbe carried out by the bell superintendent.

2 - METHODS AND MEANS

Pressure chamber

Chamber resisting the internal pressure used formaintaining workers under pressure.

-45-

Lazy shot rope

Submersible device connected to the surface andenabling the diver to identify the depth at which hemust carry out his decompression stops.

Life-line

Device enabling a diver to find his way back toopen water and the surface.

Open wet bell

Submersible craft, connected to the surfaceinstallation by a supporting cable, having a bubbleof breathing mixture and constituting a shelter forthe diver in the vicinity of the working locality andduring decompression, but not enabling transferunder pressure to surface hyperbaric equipment.

Diving system

Assembly of hyperbaric equipment for underwateroperations and handling, enabling divers to remainand transfer under pressure.

Diving bell (normal pressure or hyperbaric)

Manned underwater craft resisting internal and/orexternal pressure connected to a surfaceinstallation by a supporting cable.

A diver-carrying submersible

Submersible having a pressurizable compartmentenabling divers to leave and carry out activities inthe water.

Transfer under pressure

Procedure for enabling workers to be transferredfrom one hyperbaric chamber to another withoutsignificant pressure variation.

Clamping-unclamping

Operation which consists of connecting (clamping)or disconnecting (unclamping) two hyperbaricchambers within the framework of transferringpersonnel under pressure.

Incursion diving

Diving in the course of which the diver, whosesystem has not become saturated with gas, isdecompressed to atmospheric pressureimmediately after his operations.

Saturation operation

Hyperbaric operation during which the workerssystem reaches an equilibrium with dissolvedgases and for which the decompression curve isindependent of time.

Scuba diving

Scuba diving is the method in which the divercarries his reserve of breathing gas on himindependently of any other supply source.

Surface-supplied diving

Method of diving without using a diving system inwhich the diver is directly connected to the surfaceby his umbilical (see umbilical) which ensures hissupply of breathing mixture.

Diving in an open wet bell

Method of underwater operation using an open wetbell.

Diving with a system

Method of diving in which the methods usedenable transfer of personnel under pressurebetween the submerged site and a hyperbaricinstallation.

-46-

Umbilical

Assembly of connecting components (electrical,pneumatic, hydraulic) connecting the surface to ansubmerged craft.

Heliox

Breathing mixture based on helium and oxygen.

Nitrox

Breathing mixture based on nitrogen and oxygen,except compressed air.

Ariane line

Marked line, unrolled and fixed to the wall of atunnel, enabling a diver to find the exit even in theabsence of visibility or lighting.

Partial pressures

Pressures of each of the gases constituting amixture, the sum of which is equal to the absolutepressure.

Equivalent depth

An imaginary depth used to determine thedecompression procedure from ordinary tableswhen diving conditions (mixtures, altitude, densityof the environment etc.) require corrections tothese tables.

-47-

ANNEX II

Procedures for diving operations with compressed airor with a nitrogen-based mixture

1 - COMPRESSION PROCEDURES

The rate of descent must not exceed 30 metresper minute.

2 - DECOMPRESSION PROCEDURES

Decompression tables indicating rate of rise as afunction or parameters defining the dive : depth,time on the bottom and nature of gas breathed onthe bottom.

2.1 - Units

Times are expressed in hours, minutes andseconds (00h00:00). For any event relating to agiven dive, the time shall be taken using one watchand always the same watch.

Depths are measured in metres of sea water. Thetables may be used for fresh water withoutmodification. In principle, the depth of the diver isthat which is measured at the level of his lungs.

Pressures are expressed in hPa and in Bar.

2.2 - Field of validity of tables

Decompression tables take into account standardatmospheric pressure at the surface - rounded to1,000 hPa (1bar). The tables may accommodateslight local variations in surface pressure and beused without being questioned at altitudes varyingbetween 0 and 300 metres from sea level and for avariation of 0 to 30 hPa (0.03 bar) of barometricpressure.

In case of greater changes in altitude or surfaceatmospheric pressure, it will be

necessary to use the diving method at altitudedescribed in 10 below.

2.3 - Definitions of diving parameters

2.3.1 - Depth of dive

This is the maximum depth reached by the diverduring his dive, whatever the time actually spent atthis depth.

In the case where work requires the diver tooperate at different levels, it will be necessary toorganize the dive so that work commences at thedeepest level and repeated rises are avoided.

In principle, it is considered that the diver shouldspend his working time at the specified depth. Thetables can accommodate moderate variations inthe depth of the diver during work, but the divershould never rise above the level of the first stop.

Even at a shallow depth, during an operation in thedecompression zone without stops, the diver mustnot return to the surface in order to receive tools orinstructions. Indeed, this type of « yo-yo » diving,even near to the surface, appreciably increasesthe risk of a decompression accident.

2.3.2 - Time at the bottom of the dive

This is the time between the moment where thediver leaves the surface (or at the start ofcompression of the bell) and the moment where hestarts to rise (or the bell is decompressed).

-48-

2.3.3 - Depth and time entered in the table

Decompression tables are defined for each 3metre depth starting at 3 metres and generally thetime on the bottom is given in 10 minute intervals.

It is however rare for the depth and time at thebottom of a dive to correspond exactly to thosegiven in the tables and it is thus necessary in allcases to select a table where the depth is equal toor immediately greater than the depth of dive andto choose the time on the bottom from this tablewhich is equal to or immediately greater than thetime spent on the bottom.

The diver must always use a time from anadjustment table in the case where he exceeds theanticipated time on the bottom. For this reason, thelast time available in the table should not normallybe used.

2.3.4 - Diving interval

This consists of the interval of time spent on thesurface by a diver between two dives. It isestimated between the moment when the diver hasfinished his decompression until the time hecommences a new dive. After a dive, an interval of12 hours is generally necessary to reach completedesaturation.

The procedures applicable to successive dives aredescribed in 12 below. A single successive dive ispermitted.

2.3.5 - Rate of rise at the first stop

The rate of ascent of the diver to the first stop (orto the surface) must be accomplished at a rate ofbetween 9 and 15 metres per minute. The times ofascent indicated in the decompression tablescorrespond to the rate of ascent of 12 metres perminute.

2.3.6 - Duration of stops

Decompression stop times are indicated for eachtable. The stop time begins as soon as the diverarrives at the depth for this stop. The last minute ofthe stop time is used for ascent to the followingstop (or to the surface).

Conditions to be complied with during stops :

• Divers must not work during stops,• Divers and diving superintendents must

organize diving so as to avoid any fatiguingexercise during ascent (poor buoyancy or acurrent require effort from the diver),

• Divers in decompression within a pressurechamber, although they do not have to remainstill, should not have to carry out any intensephysical activity.

2.3.7 - Stops with oxygen

Breathing with oxygen

Breathing with pure oxygen using a mask enablesthe elimination of inner gases to be acceleratedand hence reduces in decompression time.Decompression tables with stops using oxygen arequite suitable for long and deep dives with air.

As a general rule, the deeper the stops withoxygen, the more effective they are in the processof decompression. It is for this reason the stop at 3metres is cumulated with the 6 metre stop in alltables using oxygen.

Oronasal mask used for dry decompression

The type of oronasal mask chosen and itsapplication must enable the amount of oxygenactually breathed to be as neat as possible to a100 % and escapes of oxygen to the atmosphereof the pressure vessel to be as small as possible.

-49-

Factors contributing to decompression accidents

When diving or working conditions are difficult, therisk of a decompression accident is higher.

It is an established fact that poor physicalcondition, nervous tension, poor visibility, cold andaccumulated fatigue after weeks of intensivediving, predispose a diver to decompressionsickness.

Similarly, a current, uncertain depth control andpoor sea conditions make decompressionprocedures difficult to follow and thus increase therisk of a decompression accident.

All these factors must be taken into considerationwhen a decompression table is chosen.

In the case where diving conditions are such thatthey may adversely affect decompression safety,the next longest time on the bottom in the tableshould be used in order to give the divers anadditional margin of safety.

2.3.8 - Rapid rise

In the case of a rise which is too rapid, and if thereis no recompression chamber on the site, it will benecessary to return to the half depth within lessthan three minutes and to carry out a five minutestop. Decompression is renewed, based on thetotal diving time, including re-descent and the fiveminute stop at half depth.

3 - RECOMMENDATIONSFOLLOWING DECOMPRESSION

3.1 - Activities following a dive

During the two hours following decompression, it isrecommended that divers limit their activities totasks which do not involve sustained physicaleffort, and in

particular, it is recommended that they avoidrunning, climbing stairs or participating in intensesports exercises.

3.2 - Diving following a dive

Decompression tables specify a compulsoryinterval of 12 hours between dives. This period iscompulsory before undertaking a second dive withair or nitrox. The only selection to this ruleconcerns successive dives in air, but in this case,the method described in 12 below must be used.

It is only after having completed his intervalfollowing a dive that the diver is, in principle, freefrom all remaining phenomena from his last diveand may commence another one.

3.3 - Supervision of divers following a dive

When the symptoms of a decompression accidentoccur, they generally appear within 30 minutesfollowing a return to atmospheric pressure, buthowever there are situations where they have onlyappeared after a time which can amount to 10hours.

A recompression chamber must thus beaccessible to the diver during 12 hours followinghis decompression.

4 - STANDARD AIR TABLES

4.1 - Decompression method

Decompression by stops carried out in water.

4.2 - Mixture at the bottom

Air or nitrox.

4.3 - Diving methods

• Scuba diving,• Diving with a hookah,• Diving in an open wet bell or with a diving

system.

-50-

4.4 - Air table for decompression without stops

Table 1 gives the maximum time on the bottomenabling resurfacing to be carried out

without stops, as a function of the depth of dive.At the end of the time on the bottom, the diver shallimmediately rise to the surface, following a rate ofrise of between 9 and 15 metres per minute.

TABLE N°1

TEMPS AU FOND MAXIMUM POUR DECOMPRESSION SANS PALIER

DEPTH INTERVAL BEFORE DIVE12 h 00 6 h 00 4 h 00

7.5 m9.0 m

10.5 m12 m

13.5 m15 m18 m21 m24 m27 m30 m33 m36 m39 m42 m45 m48 m51 m

Unlimited360 min270 min165 min100 min80 min50 min35 min25 min20 min15 min12 min10 min8 min7 min6 min5 min5 min

Unlimited330 min250 min150 min90 min70 min40 min25 min20 min15 min10 min7 min5 min3 min2 min

---

Unlimited300 min240 min135 min90 min60 min35 min20 min10 min10 min5 min2 min

------

-51-

TABLE N°2

SIMPLIFIED AIR/STANDARD TABLE« MINITABLE AIR »

Interval before dive : 12 hours

Depth Maximum depth time in minutes

12 m15 m18 m21 m24 m27 m30 m33 m36 m39 m42 m45 m48 m51 m54 m57 m60 m

1658050352520151210

87655---

1709055403025201515101010

8755-

180100

6045353025201715131210

8765

195110

7050403328232017141312

----

210115

7555453530

----------

240130

806050

------------

-------

252220181515121010

8

-----

40353025222018

-----

----

554538322724

-------

---

756048423732

--------

---------

2724222018161412

------

5547403430272523211917

-

-------

5547403530282624

---

---------

433833302825232118

Stops Ascent to First stop at 12 m/min (3 m each 15 sec)

12 m9 m6 m3 m

----

---3

---5

---7

---

10

---

15

--37

--3

12

--3

15

--3

20

-35

15

-37

20

-5

1025

35

1225

-52-

4.6 - Air Standard Tables

Set of decompression tables for initial bouncedives to depths ranging from 12 to 60m.

The post-dive interval after a bounce dive using onAir Standard table is generally 12 hours.

However, one (and only one) repetitive dive ispossible after short or swallow dives. This isindicated in the tables by the label « POSSIBLE ».

4.7 - Air Standard Repetitive Tables

Calculation procedures for repetitive dives aredescribed in chapter 12.

4.8 - Contingency Procedures

Exceeding the planned bottom time

• Use either the next bottom dive, or the back-upbottom time,

• Or switch to Air/Oxy/6m or Air/Oxy/12 m tables.

Difficult dive conditions (chapter 1.2.10)

• Use the next longer bottom time.

Difficulty in performing the 3 metres stop

• Perform the 3 m stop time at 6 m,• Or switch to Air/Oxy/6 m table,• Or switch to surface decompression table.

-53-

TABLE N°3

AIR / STANDARD TABLES

Depth 12 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

165170180210240270300330360

1 :000 :450 :450 :450 :450 :450 :450 :450 :45

---------

---------

---------

---------

---------

-35101525303540

1 :003 :455 :45

10 :4515 :4525 :4530 :4535 :4540 :45

PossiblePossiblePossible

NoNoNoNoNoNo

Depth 15 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

8090

100110120130140150160170180210240270

1 :151 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :00

--------------

--------------

--------------

--------------

--------------

-35712152025253035456070

1 :154 :006 :008 :00

13 :0016 :0021 :0026 :0026 :0031 :0036 :0046 :0061 :0071 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNoNoNoNo

-54-

AIR/STANDARD TABLESDepth 18 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

505560708090

100110120130140150160170180210

1 :301 :151 :151 :151 :151 :151 :151 :151 :151 :001 :001 :001 :001 :001 :001 :00

----------------

----------------

----------------

----------------

---------35710121520

-357152025303540455050556070

1 :304 :156 :158 :15

16 :1521 :1526 :1531 :1536 :1544 :0051 :0058 :0061 :0068 :0076 :0091 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNo

Depth 21 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

3540455060708090

100110120130140150180

1 :451 :301 :301 :301 :301 :301 :151 :151 :151 :151 :151 :151 :151 :001 :00

---------------

---------------

---------------

-------------35

------357101520252540

-3571520253035404550556075

1 :454 :306 :308 :30

16 :3021 :3029 :1536 :1543 :1551 :1561 :1571 :1581 :1589 :00121 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNo

-55-

AIR/STANDARD TABLES

Depth 24 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

25303540455060708090

100110120130140150

2 :001 :451 :451 :451 :451 :451 :301 :301 :301 :301 :151 :151 :151 :151 :151 :15

----------------

----------------

----------------

----------33351010

------351015202530303540

-357101520303540455060657075

2 :004 :456 :458 :45

11 :4516 :4524 :3036 :3046 :3056 :3069 :1579 :1594 :15101 :15116 :15126 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNo

Depth 27 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

2025303540455060708090

100110120130

2 :152 :002 :002 :001 :451 :451 :451 :451 :451 :301 :301 :301 :301 :301 :15

---------------

---------------

---------------

--------33510121520

----335712172530303540

-35101215203035405055657075

2 :155 :007 :00

12 :0016 :4519 :4526 :4538 :4551 :4561 :3081 :3096 :30108 :30121 :30139 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

-56-

AIR/STANDARD TABLES

Depth 30 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

152025303540455060708090

100110

2 :302 :152 :152 :152 :002 :002 :002 :001 :451 :451 :451 :301 :301 :30

--------------

--------------

-----------333

--------3510121720

----35710152025303540

-351012172025354050606575

2 :305 :157 :15

12 :1517 :0024 :0029 :0037 :0054 :4566 :4586 :45106 :30121 :30139 :30

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

Depth 33 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

12152025303540455060708090

100

2 :452 :302 :302 :152 :152 :152 :002 :002 :002 :001 :451 :451 :451 :45

--------------

--------------

----------33510

------3351012152025

---335710152025303540

-35712152025304050606575

2 :455 :307 :30

12 :1517 :1522 :1532 :0040 :0052 :0072 :0091 :45109 :45126 :45151 :45

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

-57-

AIR/STANDARD TABLES

Depth 36 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

10152025303540455060708090

3 :002 :452 :452 :302 :302 :152 :152 :152 :002 :002 :002 :001 :45

-------------

------------3

--------335712

-----335712152025

---351012152025303540

-3712172025303545556575

3 :005 :459 :45

17 :3024 :3035 :1542 :1552 :1567 :0087 :00107 :00129 :00156 :45

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

Depth 39 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

8101520253035404550607080

3 :153 :003 :002 :452 :452 :302 :302 :152 :152 :152 :152 :002 :00

-------------

-----------33

-------33351012

-----3571010152025

---35710152025303540

-357152025303545556574

3 :156 :008 :00

12 :4522 :4532 :3042 :3057 :1570 :1585 :15107 :15135 :00157 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

-58-

AIR/STANDARD TABLES

Depth 42 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

71015202530354045506070

3 :303 :153 :003 :002 :452 :452 :302 :302 :302 :302 :152 :15

------------

----------35

------33551012

----3571012151725

--33710152025253040

-35121725303540456075

3 :306 :15

11 :0018 :0029 :4542 :4557 :3070 :3084 :3092 :30122 :15159 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

Depth 45 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

610152025303540455060

3 :453 :303 :153 :003 :002 :452 :452 :452 :302 :302 :15

----------3

--------335

-----3355712

---335710121520

--357121520253035

-371220253040455565

3 :456 :30

13 :1523 :0033 :0047 :4557 :4577 :4592 :30112 :30142 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

-59-

AIR/STANDARD TABLES

Depth 48 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

510152025303540455060

4 :003 :453 :303 :153 :153 :003 :002 :452 :452 :302 :30

---------33

-------3557

-----357101015

---3571015172025

--3710152025303040

-571520303545506075

4 :008 :45

13 :3028 :1538 :1558 :0073 :0097 :45114 :45130 :30167 :30

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

Depth 51 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

5101520253035404550

4 :153 :453 :303 :303 :153 :153 :003 :002 :452 :45

--------33

------3557

----35571012

--355710151720

-357121520253035

-51217253540505565

4 :1511 :4523 :3032 :3048 :1565 :1581 :00105 :00122 :45144 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

No

-60-

AIR/STANDARD TABLES

Depth 54 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

51015202530354045

4 :154 :003 :453 :303 :303 :153 :153 :003 :00

-------35

-----3557

---35571012

--35710121520

-35101520253035

3712173035455560

7 :1514 :0023 :4538 :3060 :3076 :1597 :15121 :00142 :00

NoNoNoNoNoNoNoNoNo

Depth 57 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

510152025303540

4 :304 :154 :003 :453 :303 :303 :153 :15

------33

----3357

---357710

--357101520

-371015202530

37152030405060

7 :3014 :1529 :0041 :4563 :3083 :30108 :15133 :15

NoNoNoNoNoNoNoNo

Depth 60 metres

Minimumdepth time

Ascent tostop

min :sec

Air18 m

Air15 m

Air12 m

Air9 m

Air6 m

Air3 m

Totaldecompression

min :sec

Repetitivedive

5101520253035

4 :454 :154 :004 :003 :453 :303 :30

-----33

----355

--355710

-357101215

-5712202530

571525354555

9 :4519 :1534 :0053 :0076 :45100 :30121 :30

NoNoNoNoNoNoNo

-61-

5 - AIR/OXY/6 M TABLES

5.1 - Decompression Method

In-water decompression or saturation-divingdecompression both with pure oxygen breathing at6 m.

5.2 - Bottom Mix

Air or Nitrox.

5.3 - Diving Methods

• Surface supplied diving,• Wet bell diving,• Saturation diving.

5.4 - Air/Oxy/6 m Tables

Set of decompression tables for initial bounce todepths ranging from 12 m to 60 m.

The post-dive interval after a bounce diveperformed with an Air/Oxy/6 m table is generally12 hours.

5.5 - Repetitive Dives

One (and only one) repetitive dive is possible aftershort or swallow dive. This is indicated in thetables by the label « POSSIBLE ».

This repetitive dive must follow method describedin chapter 12.

5.6 - Contingency Procedures

Exceeding the planned bottom time

• Use either the next bottom time or the back-upbottom time,

• Or switch to Air/Oxy/12 m tables.

Difficult dive conditions

• Use the next longer bottom time.

Oxygen supply failure

• Switch to Air Standard table (if the bottom timepermits it),

• Or multiply oxygen stop time by two andperform it on air.

-62-

TABLE N°4

AIR/OXY/6 M TABLES

Depth 12 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

180210240270300330360

0 :300 :300 :300 :300 :300 :300 :30

-------

-------

-------

-------

-------

351015202025

3 :305 :30

10 :3015 :3020 :3020 :3025 :30

PossibleNoNoNoNoNoNo

Depth 15 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

90100110120130140150180210240270300

0 :450 :450 :450 :450 :450 :450 :450 :450 :450 :450 :450 :45

------------

------------

------------

------------

------------

3357710152025303545

3 :453 :455 :457 :457 :45

10 :4515 :4520 :4525 :4530 :4535 :4545 :45

PossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNoNoNo

-63-

AIR/OXY/6 M TABLES

Depth 18 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

60708090

100110120130140150180210240

1 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :00

-------------

-------------

-------------

-------------

-------------

35710151520253035405060

4 :006 :008 :00

11 :0016 :0016 :0021 :0026 :0031 :0036 :0041 :0051 :0061 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

Depth 21 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

40455060708090

100110120130140150180210

1 :151 :151 :151 :151 :151 :151 :151 :151 :151 :151 :151 :151 :001 :001 :00

---------------

---------------

---------------

---------------

------------355

33571015202525303540456070

4 :154 :156 :158 :15

11 :1516 :1521 :1526 :1526 :1531 :1536 :1541 :1549 :0066 :0076 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

-64-

AIR/OXY/6 M TABLES

Depth 24 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

303540455060708090

100110120130140150180

1 :301 :301 :301 :301 :301 :301 :301 :301 :301 :151 :151 :151 :151 :151 :151 :00

----------------

----------------

----------------

---------------3

---------3335101020

335571520253035404550556075

4 :304 :306 :306 :308 :30

16 :3021 :3026 :3031 :3039 :1544 :1549 :1556 :1566 :1571 :1599 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

Depth 27 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

25303540455060708090

100110120130140150

1 :451 :451 :451 :451 :451 :451 :451 :301 :301 :301 :301 :301 :301 :001 :001 :00

----------------

----------------

----------------

-------------333

-------335101215202525

3357101520253040455055606570

4 :454 :456 :458 :45

11 :4516 :4521 :4529 :3034 :3046 :3056 :3063 :3071 :3084 :0094 :0099 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

-65-

AIR/OXY/6 M TABLES

Depth 30 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

2025303540455060708090

100110120130140

2 :002 :002 :002 :002 :002 :002 :001 :451 :451 :451 :301 :301 :301 :301 :301 :15

----------------

----------------

---------------3

----------3335710

-------3510121720253030

3357151520303540455060657080

5 :005 :007 :009 :00

17 :0017 :0022 :0034 :4541 :4551 :4561 :3071 :3084 :3096 :30108 :30124 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

Depth 33 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

152025303540455060708090

100110120

2 :152 :152 :152 :152 :152 :002 :002 :002 :001 :451 :451 :451 :451 :301 :30

---------------

---------------

-------------33

---------335101215

-----33510121520252530

33571015203035404550606575

5 :155 :157 :159 :15

12 :1520 :0025 :0037 :0047 :0056 :4564 :4576 :4596 :45106 :30124 :30

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

-66-

AIR/OXY/6 M TABLES

Depth 36 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

152025303540455060708090

100110

2 :302 :302 :302 :302 :152 :152 :152 :152 :002 :002 :001 :451 :451 :45

--------------

--------------

-----------335

-------3357121520

----3355121520253030

3571515203035404555607080

5 :307 :309 :30

17 :3020 :1525 :1537 :1545 :1557 :0067 :0084 :00101 :45119 :45136 :45

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

Depth 39 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

10152025303540455060708090

100

2 :452 :452 :452 :452 :302 :302 :152 :152 :152 :152 :002 :002 :001 :45

--------------

-------------3

----------3357

------333510121520

----35710101520253030

3371015202530354550607080

5 :455 :459 :45

12 :4520 :3027 :3037 :1545 :1550 :1567 :1585 :00102 :00122 :00141 :45

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

-67-

AIR/OXY/6 M TABLES

Depth 42 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

10152025303540455060708090

3 :003 :003 :002 :452 :452 :302 :302 :302 :152 :152 :152 :002 :00

-------------

-----------33

---------35712

-----333510121520

---35710121517252530

351015202530354050607080

6 :008 :00

13 :0020 :4527 :4537 :3045 :3052 :3062 :1582 :15104 :15122 :00147 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

Depth 45 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

101520253035404550607080

3 :153 :153 :003 :002 :452 :452 :452 :302 :302 :152 :152 :15

------------

---------333

-------335712

----33557121520

--3357101215202530

3710152025354550556575

6 :1510 :1516 :0021 :0030 :4537 :4552 :4567 :3077 :3097 :15117 :15142 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

-68-

AIR/OXY/6 M TABLES

Depth 48 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

1015202530354045506070

3 :303 :303 :153 :153 :003 :002 :452 :452 :302 :302 :30

-----------

--------335

------355710

----35710101520

--357101517202530

37152025303540506070

6 :3010 :3021 :1528 :1538 :0048 :0062 :4574 :4590 :30112 :30137 :30

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

Depth 51 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

1015202530354045506070

3 :453 :303 :303 :153 :153 :003 :002 :452 :452 :452 :30

----------3

-------3357

-----35571012

---355710151520

-3357101520202535

510152025304045506580

8 :4516 :3021 :3031 :1540 :1551 :0070 :0085 :4597 :45122 :45159 :30

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

-69-

AIR/OXY/6 M TABLESDepth 54 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

510152025303540455060

4 :004 :003 :453 :303 :303 :153 :153 :003 :003 :002 :45

----------3

-------3357

-----33571010

---355710121520

--357101215202530

37101525354050556575

7 :0011 :0016 :4526 :3040 :3056 :1565 :1586 :00100 :00123 :00147 :45

NoNoNoNoNoNoNoNoNoNoNo

Depth 57 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

5101520253035404550

4 :154 :154 :003 :453 :303 :303 :153 :153 :003 :00

--------33

------3355

----3357710

---3577101215

--3571015202525

371520253545505565

7 :1511 :1522 :0031 :4543 :3058 :3078 :1593 :15110 :00126 :00

NoNoNoNoNoNoNoNoNoNo

Depth 60 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Air12 m

Air9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

510152025303540

4 :304 :154 :004 :003 :453 :303 :303 :15

-------3

-----335

----3557

--35571015

-35710121520

37152030404555

7 :3014 :1527 :0036 :0051 :4570 :3081 :30108 :15

NoNoNoNoNoNoNoNo

-70-

6 - AIR/OXY/12 M TABLES

6.1 - Decompression Method

Decompression stops made in wet bell diver beingdry or in bell diver breathing oxygen at 12 m, 9 mand 6 m stops.

6.2 - Bottom Mix

Air or Nitrox.

6.3 - Diving Methods

• Wet bell dive,• Saturation dive.

6.4 - Air/Oxy/12 m Tables

Set of decompression tables for dives to depthsranging from 15 m to 60 m.

The post-dive interval after a dive using anAir/Oxy/12 m table is generally 12 hours.

6.5 - Repetitive Dive

One (and only one) repetitive dive is possible aftershort or swallow dive. This is indicated in thetables by the label « POSSIBLE ».

This repetitive dive must be carried out followingmethod described in chapter 12.

6.6 - Contingency Procedures

Exceeding the planned bottom time

• Use either the next bottom time or the back-upbottom time.

Difficult dive conditions

• Use the next longer bottom time.

Oxygen supply failure

• Switch to air standard table (if the bottom timepermits it),

• Or multiply oxygen stop times by 2 and performthem on air.

-71-

TABLE N°5 - AIR/OXY/12 M TABLESDepth 15 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

150180210240270300330

0 :150 :150 :150 :150 :150 :150 :15

-------

-------

-------

55510101515

551010101515

5101010151520

15 :1520 :1525 :1530 :1535 :1545 :1550 :15

PossibleNoNoNoNoNoNo

Depth 18 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

110120130140150180210240270300

0 :300 :300 :300 :300 :300 :300 :300 :300 :300 :30

----------

----------

----------

55510101015202025

551010101515202025

5101010151520202530

15 :3020 :3025 :3030 :3035 :3040 :3050 :3060 :3065 :3080 :30

PossiblePossiblePossiblePossiblePossible

NoNoNoNoNo

Depth 21 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

8090

100110120130140150180210240270

0 :450 :450 :450 :450 :450 :450 :450 :450 :450 :450 :450 :45

------------

------------

------------

55551010101520202530

5510101010151520253035

51010101015151520253040

15 :4520 :4525 :4525 :4530 :4535 :4540 :4545 :4560 :4570 :4585 :45105 :45

PossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNoNoNo

-72-

AIR/OXY/12 M TABLES

Depth 24 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

60708090

100110120130140150180210240

1 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :001 :00

-------------

-------------

-------------

55510101015152020253030

551010101515202020303540

5101010151520202025303550

16 :0021 :0026 :0031 :0036 :0041 :0051 :0056 :0061 :0066 :0086 :00101 :00121 :00

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNoNoNo

Depth 27 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

5060708090

100110120130140150180210

1 :151 :151 :151 :151 :151 :151 :151 :151 :151 :151 :151 :151 :15

-------------

-------------

-------------

55510101515202025253030

551010151520202525304040

5101015

1542020202530304065

16 :1521 :1526 :1536 :1541 :1551 :1556 :1561 :1571 :1581 :1586 :15111 :15136 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNoNoNo

-73-

AIR/OXY/12 M TABLES

Depth 30 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

405060708090

100110120130140150180

1 :301 :301 :301 :301 :301 :301 :301 :301 :301 :301 :151 :151 :15

-------------

-------------

----------333

551010151520202530303030

551010152020252530354040

5101015152025253030354570

16 :3021 :3031 :3036 :3046 :3056 :3066 :3071 :3081 :3091 :30104 :15119 :15144 :15

PossiblePossiblePossiblePossiblePossiblePossiblePossible

NoNoNoNoNoNo

Depth 33 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

405060708090

100110120

1 :451 :451 :451 :451 :451 :451 :451 :301 :30

---------

---------

-------33

5510151520252530

51015152020253030

51515152025253035

16 :4531 :4541 :4546 :4556 :4566 :4576 :4589 :3099 :30

PossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

-74-

AIR/OXY/12 M TABLES

Depth 36 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

30405060708090

100110

2 :002 :002 :002 :002 :002 :001 :451 :451 :45

---------

---------

------335

5510151520253030

51015152020253035

51015152025303040

17 :0027 :0042 :0047 :0057 :0067 :0084 :4594 :45111 :45

PossiblePossiblePossiblePossiblePossiblePossible

NoNoNo

Depth 39 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

30405060708090

100

2 :152 :152 :152 :152 :002 :002 :001 :45

--------

-------3

----3357

510151520253030

510152020253035

1010152025303040

22 :1532 :1547 :1557 :1570 :0085 :0097 :00116 :45

PossiblePossiblePossiblePossiblePossible

NoNoNo

-75-

AIR/OXY/12 M TABLES

Depth 42 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

2530405060708090

2 :302 :302 :302 :302 :152 :152 :002 :00

--------

------33

----35712

55101520252530

55151520253035

510152025303040

17 :3022 :3042 :3052 :3070 :1587 :1597 :00122 :00

PossiblePossiblePossiblePossiblePossible

NoNoNo

Depth 45 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

2025304050607080

2 :452 :452 :452 :452 :302 :152 :152 :15

--------

-----333

----35712

5551515202530

55101520253035

510101520253035

17 :4522 :4527 :4547 :4560 :3080 :1597 :15117 :15

PossiblePossiblePossiblePossiblePossible

NoNoNo

-76-

AIR/OXY/12 M TABLES

Depth 48 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

20253040506070

3 :003 :003 :002 :452 :302 :302 :30

-------

----335

---35710

551015202530

551015202530

5101020203035

18 :0023 :0033 :0055 :4570 :3092 :30112 :30

PossiblePossiblePossiblePossiblePossible

NoNo

Depth 51 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

1520253040506070

3 :153 :153 :153 :153 :002 :452 :452 :30

-------3

-----357

----571012

5551015202530

55101015253035

510101520253040

18 :1523 :1528 :1538 :1558 :0082 :45102 :45129 :30

PossiblePossiblePossiblePossiblePossible

NoNoNo

-77-

AIR/OXY/12 M TABLES

Depth 54 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

15202530405060

3 :303 :303 :303 :153 :003 :002 :45

------3

----357

---35710

551010152530

551010202530

5101015202535

18 :3023 :3033 :3041 :1566 :0090 :00117 :45

NoNoNoNoNoNoNo

Depth 57 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

15202530405060

3 :453 :453 :303 :303 :153 :003 :00

-----35

----3510

--33101012

551015202530

5101015203035

5101015253040

18 :4528 :4536 :3051 :3081 :15106 :00135 :00

NoNoNoNoNoNoNo

Depth 60 metres

Minimumdepth time

Ascent tostop

min :sec

Air21 m

Air18 m

Air15 m

Oxy12 m

Oxy9 m

Oxy6 m

Totaldecompression

min :sec

Repetitivedive

152025304050

4 :004 :003 :453 :303 :153 :15

----35

---357

--351010

51010152030

51010202530

101015202530

24 :0034 :0041 :4566 :3091 :15115 :15

NoNoNoNoNoNo

-78-

7 - SURFACE DECOMPRESSION TABLES

7.1 - Decompression Method

Surface decompression method must be used onlywhen in-water decompression risks to endangerthe diver : oil, current, temperature, presence ofexplosives...

This procedure requires recompression process tobe started immediately, after the diver gets out thewater (surface interval as short as possible andnever over four minutes counted from the end ofthe eventual 9 m stop until dry recompression at1,200 hPa (1.2 bar). During this interval, physicalexertion must be avoided. Once in the chamber,the diver must immediately drink a large amount ofnon-gaseous water.

7.2 - Bottom Mix

Air or Nitrox.

7.3 - Diving Methods

• Scuba diving,• Surface-supplied diving,• Wet bell diving.

7.4 - Surface Decompression Tables

Set of decompression tables for first dives todepths ranging from 12 m to 51 m.

No repetitive dive is allowed. The post-dive intervalafter a dive using a surface decompression table istwelve hours.

The surface decompression methods areforbidden at altitudes higher than 300 metres.

7.5 - Contingency Procedures

Exceeding the planned bottom time

• Use either the next bottom or the back-upbottom time,

• Or switch to air standard tables (with in-waterdecompression),

• Or switch to Air/Oxy/6 m tables (with in-waterdecompression),

• Or to Air/Oxy/12 m tables (with bell diving only).

Difficult dive conditions

• Use the next longer bottom time.

Exceeding the surface interval beforerecompression

• If the surface interval exceeds four minutes butdoes not exceed five minutes, switch to thenext longer table time,

• If the surface interval exceeds five minutes,consider the dive as a shorteneddecompression and apply emergencyprocedure planned for a type 1 decompressionaccident (annex VI).

Failure of oxygen supply in chamber

• Decompress the divers on air using airstandard table for the same depth of dive. Usethe maximum table time available for safety.

-79-

TABLE N°6

AIR/SURFACE DECOMPRESSION TABLES

Depth 12 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

180210240270300330360

1 :001 :001 :001 :001 :001 :001 :00

-------

-------

-------

3333333

10101020252530

6666666

20 :0020 :0020 :0030 :0035 :0035 :0040 :00

12h0012h0012h0012h0012h0012h0012h00

Depth 15 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

90100110120130140150180

1 :151 :151 :151 :151 :151 :151 :151 :15

--------

--------

--------

33333333

1010101010152025

66666666

20 :1520 :1520 :1520 :1520 :1525 :1530 :1535 :15

12h0012h0012h0012h0012h0012h0012h0012h00

-80-

AIR/SURFACE DECOMPRESSION TABLES

Depth 18 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

60708090

100110120130140150

1 :301 :301 :301 :301 :301 :301 :301 :301 :301 :30

----------

----------

----------

3333333333

10101015202525304040

6666666666

20 :3020 :3020 :3025 :3030 :3035 :3035 :3040 :3050 :3050 :30

12h0012h0012h0012h0012h0012h0012h0012h0012h0012h00

Depth 21 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

40455060708090

100110120

1 :451 :451 :451 :451 :451 :451 :451 :451 :451 :45

----------

----------

----------

3333333333

10101010152025354045

6666666666

20 :4520 :4520 :4520 :4525 :4530 :4535 :4545 :4550 :4555 :45

12h0012h0012h0012h0012h0012h0012h0012h0012h0012h00

-81-

AIR/SURFACE DECOMPRESSION TABLES

Depth 24 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

303540455060708090

2 :002 :002 :002 :002 :002 :002 :002 :002 :00

---------

---------

---------

333333333

101010101015253540

666666666

21 :0021 :0021 :0021 :0021 :0026 :0036 :0046 :0051 :00

12h0012h0012h0012h0012h0012h0012h0012h0012h00

Depth 27 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

2530354045506070

2 :152 :152 :152 :152 :152 :152 :151 :30

--------

--------

-------3

33333333

1010101015203040

66666666

21 :1521 :1521 :1521 :1526 :1531 :1541 :1553 :30

12h0012h0012h0012h0012h0012h0012h0012h00

-82-

AIR/SURFACE DECOMPRESSION TABLES

Depth 30 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

2025303540455060

2 :302 :302 :302 :302 :302 :302 :301 :45

--------

--------

-------3

33333333

1010101520202540

66666666

21 :3021 :3021 :3026 :3031 :3031 :3036 :3053 :45

12h0012h0012h0012h0012h0012h0012h0012h00

Depth 33 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

152025303540455060

2 :452 :452 :452 :452 :452 :452 :002 :002 :00

---------

---------

------3510

333333333

101010152025303545

666666666

21 :4521 :4521 :4526 :4531 :4536 :4544 :4551 :0066 :00

12h0012h0012h0012h0012h0012h0012h0012h0012h00

-83-

AIR/SURFACE DECOMPRESSION TABLES

Depth 36 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

1520253035404550

3 :003 :003 :003 :002 :152 :152 :152 :00

--------

-------3

----3357

33333333

1010152025303540

66666666

22 :0022 :0027 :0032 :0039 :1544 :1551 :1561 :15

12h0012h0012h0012h0012h0012h0012h0012h00

Depth 39 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

10152025303540

3 :153 :153 :153 :152 :302 :302 :15

-------

------3

----357

3333333

10101015253035

6666666

22 :1522 :1522 :1527 :1539 :3046 :3056 :15

12h0012h0012h0012h0012h0012h0012h00

-84-

AIR/SURFACE DECOMPRESSION TABLES

Depth 42 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

10152025303540

3 :303 :303 :302 :452 :452 :302 :30

-------

-----33

---35710

3333333

10101525303540

6666666

22 :3022 :3027 :3039 :4546 :4556 :3064 :30

12h0012h0012h0012h0012h0012h0012h00

Depth 45 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

1015202530

3 :453 :453 :003 :003 :15

-----

----3

--335

33333

1010152530

66666

22 :4522 :4530 :0040 :0050 :15

12h0012h0012h0012h0012h00

-85-

AIR/SURFACE DECOMPRESSION TABLES

Depth 48 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

1015202530

4 :004 :003 :153 :153 :00

-----

----3

--357

33333

1010202535

66666

23 :0023 :0035 :1542 :1557 :00

12h0012h0012h0012h0012h00

Depth 51 metres

Minimumdepth time

Ascent tostop

In water SurfaceInterval

In ChamberTotal

Intervalafter

min min :sec Air15 m

Air12 m

Air9 m

Inferiorto Oxy

12 mOxy12-0

decompressionmin :sec

dive

1015202530

4 :153 :303 :303 :153 :15

-----

---35

-3557

33333

1015253040

66666

23 :1530 :3042 :3050 :1564 :15

12h0012h0012h0012h0012h00

-86-

8 - NITROX DIVING

8.1 - Decompression Method

The diver breathes a nitrox mix during the dive.The same nitrox mixture is breathed during thedecompression, except for the decompressiontables using oxygen, where the diver switches tooxygen breathing at the required stop depth.

The diver is decompressed according to a table ofequivalent depth. This equivalent depth isshallower than the actual dive depth and thereforerelated to a shorter decompression time. Thehigher the oxygen percentage, the shorter thedecompression time.

8.2 - Bottom Mix

The composition or a nitrox mix is set under theform A/B where A indicates the oxygen percentageand B the nitrogen percentage.

Nitrox use is limited to a maximum oxygen partialpressure of 1,600 hPa (1.6 bar) in in-waterbreathing.

8.3 - Diving Methods

• Scuba diving,• Surface-supplied diving,• Wet bell diving,• Saturation diving.

8.4 - Decompression Tables

There are no specific nitrox tables. The diver isdecompressed using an air table, according to theequivalent depth.

The table used can either be an air standard, anAir/Oxy/6 m, an Air/Oxy/12 m or a surfacedecompression table using oxygen.

The method can be used for an initial bounce diveor a repetitive dive.

8.5 - Post-Dive Interval

Same as for the decompression table selected.

8.6 - Calculation

• Determine dive depth,• Use table n°7, to determine equivalent depth

according to nitrox mixture used,• Use this equivalent depth to select the

decompression table depth.

How to use the table

• Determine dive actual depth,• Select composition of nitrox mix,• Read equivalent depth,• Use equivalent depth to select decompression

table.

-87-

TABLE N°7

PROCEDURE FOR NITROX DIVINGEQUIVALENT DEPTH METHOD

Real Nitrox MixDepth (m) 25/75 (m) 30/70 (m) 35/65 (m) 40/60 (m) 45/55 (m) 50/50 (m)

910111213141516171819202122232425262728293031323334353637383940414243

99

121212151515181818212121242424272727303030303333333636363939394242

999

1212121515151518181821212124242424272727303030303333333636363939

69999

12121215151515181818182121212424242427272730

6669999

121212151515151818181821212121

666699999

1212121215151515

336666699999

1212

Equivalent depth to use for the dive

-88-

9 - MULTI LEVEL DIVING

9.1 - Decompression Method

The aim of these tables is to optimize thedecompression time of a dive that has beenperformed at different depths.

Normally, when a diver designed for multi leveldiving (table n°8), the diver can be decompressedaccording to an equivalent depth. As thisequivalent depth lies in between the workingdepths, it is therefore related to a shorterdecompression time.

However, the method has the following limitations :

• The levels must be sorted in decreasingdepths,

• The last level depth should be deeper than firststop of the final decompression (divers are notallowed to work during decompression stops).

9.2 - Bottom Mix

Air only.

9.3 - Decompression Tables

There are no specific tables for multi level diving.The diver is decompressed according to anequivalent depth using an air decompression table.

The table can either be an air standard, anAir/Oxy/6 m, an Air/Oxy/12 m or a surfacedecompression table.

9.4 - Post-Dive Interval

Same as for the decompression table selected.

9.5 - Calculation

• Equivalent depth must be calculated before theoperation,

• Determine depth and bottom time of each worklevel,

• Use table n°8 to calculate the equivalent depth,• If the exact values of times and depths are not

mentioned in the table, use the next greatervalues,

• Always work out the calculation of theequivalent depth before the dive in order tomake sure there is an available correspondingdecompression table.

How to use the table

• Determine the first working depth D1 and theassociate bottom time T1 and enter the tablewith D1 and T1 and read the coefficient C1,

• Determine the second working depth D2 andthe associate bottom time T2 and enter thetable with T2 and D2 and read the coefficientC2,

• Add T1 to T2 to obtain the total bottom T3which can be used to calculate the equivalentdepth,

• Add C1 to C2 to obtain the sum of thecoefficient C3,

• Use the table to determine the equivalentdepth. Find T3 in the time column. Read acrossto find the coefficient equal to or greater thanC3. Read up from this to get the equivalentdepth,

• Select the decompression table using thisequivalent depth and T3 as bottom time.

-89-

TABLE N°8

PROCEDURE FOR MULTI LEVEL DIVING

EQUIVALENT DEPTH METHOD

Time spent towork level (min)

Work level depth

9m 12m 15m 18m 21m 24m 27m 30m 33m 36m 39m 42m 45m 48m 51m

51015202530405060708090100110120130140150180210240270300

59

141823273645546372819099

100117126135162189216243270

612182430364860728496

108120132144156168180216252288324360

81523303845607590

105120135150165180195210225270315360405450

918273645547290

108126144162180198216234252270324378432486540

11213142526384

105126147168189210231252273294315378441504567

12243648607296

120144168192216240264288312336360432504576

142741546881

108135162189216243270297324351378405486567

153045607590

120150180210240270300330360390420450540

173350668399

132165198231264297330363396429462495

1836547290

108144180216252288324360396432468504

2039597898

117156195234273312351390429468507

21426384

105126168210252294336378420462504

23456890

113135180225270315360405450495

24487296

120144192240288336384432480

265177

102128153204255306357408459

-90-

10 - ALTITUDE DIVING

10.1 - Decompression Method

Altitude diving requires adaptation ofdecompression tables due to the variation ofsurface atmospheric pressure (which gets less asaltitude increases).

Note that reading of depth gauges with a closedmanometric cell are modified by the variation of thereference pressure due to the difference betweenthe local and normal atmospheric pressures. Thedepth read at the gauge is shallower than theactual depth.

10.2 - Decompression Tables

The adaptation of the decompression tables ismade by the use of an equivalent depth. The timeof ascent to first stop, stop times and stop depthare not modified.

The equivalent depth is always deeper than theactual depth and the decompression time istherefore always longer than at sea level.

The method can be used for initial bounce dives orrepetitive dives.

10.3 - Post-Dive Interval

Same as for the decompression table selected.

10.4 - Calculation

Always work out the calculation of the equivalentdepth before the dive to ensure there is acorresponding decompression table.

• Determine the local altitude in metres (or actualatmospheric pressure in millibar or hPa),

• Determine the actual dive depth in metres,• Use table to determine the equivalent depth

(n°9),• Use this equivalent depth to select the

decompression table.

How to use the table :

• Determine dive actual depth in metres,• Determine local altitude (or local atmospheric

pressure),• Read equivalent depth,• Use equivalent depth to select decompression

table.

-91-

TABLE N°9PROCEDURE FOR ALTITUDE DIVING

EQUIVALENT DEPTH METHOD

Real ALTITUDE / ATMOSPHERIC PRESSUREDepth 300-500m 500-1000m 1000-1500m 1500-2000m 2000-2500m 2500-3000m

(m) 950mbar 900mbar 850mbar 800mbar 750mbar 700mbar56789101112131415161718192021222324252627282930313233343536373839404142434445464748

999912121515151818182121212424242727273030303333363636393939424242454545484848515154

9991212151515181818212124242427272730303033333636363939394242454545484848515154545457

99121215151518182121212424272727303030333336363639394242424545484848515154545457576060

91212151515181821212424242727303030333336363939394242454545484851515454545757606060

1212151518181821212424272730303033333636393942424545454848515154545457576060

1215151818212124242727303030333336363939424245454848515154545757606060

-92-

4950

5454

5757

60

-93-

11 - MUD DIVING

11.1 - Decompression Method

Mud diving requires the adaptation ofdecompression tables because of the increaseddensity of the liquid.

The method described below allows diving with amud density varying from 1.1 to 1.4.

11.2 - Diving Methods

Surface supplied diving or scuba diving with lifelineto surface.

11.3 - Decompression Tables

The adaptation of the decompression tables ismade by the use of an equivalent depth. The timeof ascent to first stop, stop times and stop depthsare not modified.

The equivalent depth is always deeper than theactual dive depth and the decompression time istherefore always longer than for sea water diving.

The method can be used for all decompressiontables presented in this manual except for surfacedecompression tables using oxygen.

The tables can be used for initial first dives orrepetitive dives, still using an equivalent depth.

11.4 - Post-Dive Interval

Same as for decompression table selected.

11.5 - Calculation

Always work out the calculation of the equivalentdepth before the dive in order to ensure there is acorresponding decompression table.

• Determine the mud density,• Determine the actual dive depth in metres,• Use table n°10 to determine the equivalent dive

depth,• Use the equivalent depth to select the

decompression table.

How to use the table

• Determine dive actual depth in metres,• Determine mud density,• Read equivalent depth,• Use equivalent depth to select decompression

table.

-94-

TABLE N°10PROCEDURE FOR MUD DIVINGEQUIVALENT DEPTH METHOD

MUD DENSITYDEPTH

(m)1.1(m)

1.2(m)

1.3(m)

1.4(m)

56789

101112131415161718192021222324252627282930313233343536373839404142434445464748

6999

12121515151818182121212424272727303030333333363639393942424245454848485151515454

699

1212151515181818212121242427273030333333363636393942424245454848485151545454575760

99

12121215151818212121242427273030303333363639393942424545484851515154545757606060

99

121215151818212121242427273030333336363939424242454548485151545457576060

-95-

4950

5457

60

-96-

12 - REPETITIVE DIVE PROCEDURES

12.1 - Equivalent time method

The equivalent time method is used with airstandard, Air/Oxy/6 m and Air/Oxy/12 m, breathingair or nitrox.

It is prohibited with surface decompression tables.

This method can be used for a first repetitive diveafter first dives bearing the mention « REPETITIVEDIVE POSSIBLE » in the decompression table.

Equivalent bottom time depends on depth ofrepetitive dive and the surface interval. It does notdepend on the characteristics of preceding dive.

Equivalent time is found in table 11 by reading, atintersection of surface interval and repetitive divedepth columns, the time to be added to actual timewhich will give bottom equivalent time.

This equivalent time is used to enter the selecteddecompression table using the repetitive diveactual depth.

If in air standard, Air/Oxy/6 m and Air/Oxy/12 mtables the bottom equivalent time corresponds toan ascent without stop, it is advised, as safetyprecaution, to make a decompression stop of 3minutes at 3 metres.

12.2 - Added-Time Method

This method is used with all decompression tablesbreathing air and/or with oxygen stops, exceptsurface decompression tables. It is less performingmethod than equivalent time method : it leads tolonger decompression durations.

The method is based on the assumption that thetwo dives constitute one dive only. The firstdecompression and the surface interval areignored.

To determine the repetitive dive decompression,the second dive decompression will consider :

• A time equal to the sum of bottom times of thetwo dives,

and either :• The deepest depth reached during the two

dives especially if it is reached during thesecond dive,

• Or the equivalent depth determined by themulti-level diving method in table 8, when thesecond dive is the most shallow of the two.

-97-

TABLE N°11

EQUIVALENT TIMES TABLE FOR REPETITIVE DIVE

RepetitiveDive Surface interval included between :

Depth(m)

0h000h29

0h300h44

0h450h59

1h001h29

1h301h59

2h002h59

3h003h59

4h004h59

5h005h59

6h0011h59

12-1515-1818-2021-2324-2627-2930-3233-3536-3839-4142-4445-4748-50

51

11085655550454035303025252525

9070554540353030252525202020

8060504535353025252520202020

7055454035302525252020201515

6050403525252520202015151515

5040302525202020151515151510

4030252015151515151010101010

302015151510101010101010105

201010101010105555555

151010105555555555

Length to add to real time to obtain equivalent time.

-98-

ANNEX III

DIVING PROCEDURESWITH HELIUM MIX

A - BOUNCE DIVES

1 - HELIOX/OXY/6 M TABLES

1.1 - Heliox/Oxy/6m Tables

Set of decompression tables for dives to depthsranging from 30 to 60 m.

The post-dive interval for a dive whosedecompression was made using a heliox/oxy/6 mtable is twelve hours minimum. No repetitive diveis allowed during this interval whatever breathinggas was used.

1.2 - Diving Methods

SCUBA, surface-supplied or wet-bell diving can beused within the limits of these methods.

1.3 - Decompression Procedures

• Speed of ascent to first stop between 9 and 15m/min,

• In-water decompression will stops each 3metres up to 6 metres,

• The last minute of decompression stop durationused to ascend to next stop level,

• At the end of decompression, the diver ascendsdirectly from the 6 m stop to the surface duringthe last minute of this stop.

1.4 - Dive Mix

1.4.1 - Bottom Mix

Bottom mix is a heliox mix with an oxygenpercentage ranging from 0.850 bar (850 hPa) to1.550 bar (1550 hPa) at working depth of diver.Tables are given for a bottom mix with an oxygenpercentage varying by 2% at a time.

1.4.2 - Decompression Mix

The first part of decompression is made with helioxbottom mix. The stop at 6 m and the ascent to thesurface is made on pure oxygen breathing.

1.5 - Contingency Procedures

Exceeding the planned bottom time

• Use either the next bottom time or the back-upbottom time,

• Or switch to heliox/oxy/12 m tables.

Difficult dive conditions

Play safe and, in the table, use the timeimmediately above the one corresponding to thetime actually spent.

Oxygen failure

Multiply by two the pure oxygen stop time plannedat 6 m and perform it on heliox 20/80 or on air.

-99-

TABLE N°1

BOTTOM MIXES FOR HELIOX/OXY/6M TABLES

DiveDepth

Oxygen percentage in the heliox bottom mix

(m)28.0-29.9% 26.0-27.9% 24.0-25.9% 22.0-23.9% 20.0-21.9% 18.0-19.9%

30

33

36

39

42

45

48

51

54

57

60

63

66

69

72

-100-

HELIOX/OXY/6M TABLES

Depth : 30 metres Heliox 28-30 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 12 m28-30% 9 m

--

--

-3

-3

-5

310

310

310

515

Oxygen 6 m 3 5 10 15 20 20 25 30 35Total decompression 0h06 0h07 0h15 0h20 0h27 0h35 0h40 0h45 0h57

Depth : 30 metres Heliox 28-30 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 12 m28-30% 9 m

515

515

1015

1020

Oxygen 6 m 40 40 45 50Total decompression 1h02 1h02 1h12 1h22

Depth : 33 metres Heliox 28-30 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 15 m

12 m28-30% 9 m

---

--3

--3

-35

-310

-510

-510

-1015

31015

Oxygen 6 m 3 10 10 15 20 25 30 35 40Total decompression 0h06 0h15 0h15 0h25 0h35 0h42 0h47 1h02 1h10

Depth : 33 metres Heliox 28-30 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 15 m

12 m28-30% 9 m

31015

31020

31520

51525

Oxygen 6 m 45 50 55 55Total decompression 1h15 1h25 1h35 1h42

Depth : 36 metres Heliox 28-30 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 15 m

12 m28-30% 9 m

---

--3

-35

-35

3510

3510

31015

51015

51020

Oxygen 6 m 3 10 15 20 25 30 35 40 45Total decompression 0h06 0h16 0h25 0h30 0h45 0h50 1h05 1h12 1h22

-101-

HELIOX/OXY/6M TABLES

Depth : 36 metres Heliox 28-30 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

18 mHeliox 15 m28-30% 12 m

9 m

-51520

-101520

-101525

3101525

Oxygen 6 m 50 55 60 65Total decompression 1h32 1h42 1h52 2h00

Depth : 39 metres Heliox 28-30 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2

18 mHeliox 15 m28-30% 12 m

9 m

----

--33

--35

-3510

-3510

-51015

351015

3101020

3101520

Oxygen 6 m 5 10 15 20 25 35 40 45 50Total decompression 0h08 0h19 0h26 0h40 0h45 1h07 1h15 1h30 1h40

Depth : 39 metres Heliox 28-30 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

18 mHeliox 15 m28-30% 12 m

9 m

3101520

5101525

5152025

5152030

Oxygen 6 m 55 60 65 75Total decompression 1h45 1h57 2h12 2h27

Depth : 42 metres Heliox 28-30 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2

18 mHeliox 15 m28-30% 12 m

9 m

---3

--35

-355

-3510

351010

351015

5101015

5101520

5101525

Oxygen 6 m 5 10 15 25 30 35 45 50 55Total decompression 0h11 0h21 0h31 0h46 1h00 1h10 1h27 1h42 1h52

-102-

HELIOX/OXY/6M TABLES

Depth : 42 metres Heliox 28-30 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

21 mHeliox 18 m

15 m28-30% 12 m

9 m

310101525

310152030

310152030

310152535

Oxygen 6 m 60 70 75 80Total decompression 2h05 2h30 2h35 2h50

Depth : 30 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 12 m26-28% 9 m

--

--

-3

-5

35

310

310

510

515

Oxygen 6 m 3 5 10 15 20 25 30 30 35Total decompression 0h06 0h07 0h15 0h22 0h30 0h40 0h45 0h47 0h57

Depth : 30 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 12 m26-28% 9 m

1015

1020

1020

1520

Oxygen 6 m 40 45 50 55Total decompression 1h07 1h17 1h22 1h32

Depth : 33 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 15 m26-28% 12 m

9 m

---

--3

--5

-35

-510

-510

31015

31015

31015

Oxygen 6 m 3 10 15 20 20 25 30 35 40Total decompression 0h06 0h15 0h22 0h30 0h37 0h42 1h00 1h05 1h10

-103-

HELIOX/OXY/6M TABLES

Depth : 33 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 15 m26-28% 12 m

9 m

51020

51520

51525

51525

Oxygen 6 m 45 50 55 60Total decompression 1h22 1h32 1h42 1h47

Depth : 36 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 15 m26-28% 12 m

9 m

---

--3

-35

-510

3510

31010

51015

51015

101520

Oxygen 6 m 3 10 15 20 25 30 35 40 45Total decompression 0h06 0h16 0h25 0h37 0h45 0h55 1h07 1h12 1h32

Depth : 36 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m

15 m26-28% 12 m

9 m

3101520

3101525

3102025

3152030

Oxygen 6 m 55 60 65 70Total decompression 1h45 1h55 2h05 2h20

Depth : 39 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 18 m

15 m26-28% 12 m

9 m

----

--33

-355

-3510

-51010

351015

3101015

3101520

5101520

Oxygen 6 m 5 10 15 25 30 35 40 45 55Total decompression 0h08 0h19 0h30 0h45 0h57 1h10 1h20 1h35 1h47

-104-

HELIOX/OXY/6M TABLES

Depth : 39 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m

15 m26-28% 12 m

9 m

5101525

10152030

10152030

10152035

Oxygen 6 m 60 65 70 80Total decompression 1h57 2h22 2h27 2h42

Depth : 42 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2

21 mHeliox 18 m

15 m26-28% 12 m

9 m

----3

---35

--355

-35510

-351015

-5101015

-5101520

35101520

310101525

Oxygen 6 m 5 10 20 25 30 40 45 50 60Total decompression 0h11 0h21 0h36 0h50 1h05 1h22 1h37 1h45 2h05

Depth : 42 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

21 mHeliox 18 m

15 m26-28% 12 m

9 m

310152030

310152030

510152535

515202535

Oxygen 6 m 65 75 80 85Total decompression 2h25 2h35 2h52 3h07

Depth : 45 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2

21 mHeliox 18 m

15 m26-28% 12 m

9 m

----3

--335

-33510

-351010

3551015

35101020

35101520

510101525

510152030

Oxygen 6 m 5 15 20 30 35 45 50 60 65Total decompression 0h11 0h29 0h44 1h01 1h15 1h35 1h45 2h07 2h27

-105-

HELIOX/OXY/6M TABLESDepth : 45 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

24 mHeliox 21 m

18 m26-28% 15 m

12 m9 m

31010152030

31010152535

31015202540

31015203040

Oxygen 6 m 75 80 90 95Total decompression 2h45 3h00 3h25 3h35

Depth : 30 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 12 m24-26% 9 m

--

-3

-3

35

310

310

510

1015

1015

Oxygen 6 m 3 10 10 15 20 25 30 35 40Total decompression 0h06 0h15 0h15 0h25 0h35 0h40 0h47 1h02 1h07

Depth : 30 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

15 mHeliox 12 m24-26% 9 m

31020

31520

31520

31525

Oxygen 6 m 45 45 50 55Total decompression 1h20 1h25 1h30 1h40

Depth : 33 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2

15 mHeliox 12 m24-26% 9 m

---

--3

-35

-35

-510

31010

31015

31015

51020

Oxygen 6 m 3 10 15 20 25 30 35 40 45Total decompression 0h06 0h15 0h25 0h30 0h42 0h55 1h05 1h10 1h22

Depth : 33 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

15 mHeliox 12 m24-26% 9 m

51520

101525

101525

102030

Oxygen 6 m 50 55 60 65Total decompression 1h32 1h47 1h52 2h07

-106-

HELIOX/OXY/6M TABLES

Depth : 36 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2

18 mHeliox 15 m24-26% 12 m

9 m

----

--33

--35

-3510

-3510

-51015

-51015

3101520

3101520

Oxygen 6 m 5 10 15 20 25 35 40 45 50Total decompression 0h08 0h18 0h25 0h40 0h45 1h07 1h12 1h35 1h40

Depth : 36 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

18 mHeliox 15 m24-26% 12 m

9 m

3101525

5102025

5152030

5152030

Oxygen 6 m 55 60 70 75Total decompression 1h50 2h02 2h22 2h27

Depth : 39 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2

18 mHeliox 15 m24-26% 12 m

9 m

---3

--35

-355

-3510

351015

351015

5101520

5101520

5101525

Oxygen 6 m 5 10 20 25 30 35 45 50 55Total decompression 0h11 0h21 0h35 0h45 1h05 1h10 1h37 1h42 1h52

Depth : 39 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

21 m18 m

Heliox 15 m24-26% 12 m

9 m

310152030

310152030

310152535

310152535

Oxygen 6 m 65 70 75 85Total decompression 2h25 2h30 2h45 2h55

-107-

HELIOX/OXY/6M TABLES

Depth : 42 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2

21 m18 m

Heliox 15 m24-26% 12 m

9 m

----3

--335

--3510

-351010

-351015

35101020

35101520

310101525

510152030

Oxygen 6 m 5 15 20 25 35 40 50 55 65Total decompression 0h11 0h29 0h41 0h55 1h10 1h30 1h45 2h00 2h27

Depth : 42 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

21 m18 m

Heliox 15 m24-26% 12 m

9 m

510152030

510152535

1015202540

1015203040

Oxygen 6 m 70 80 85 95Total decompression 2h32 2h52 3h17 3h32

Depth : 45 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2

24 m21 m

Heliox 18 m15 m

24-26% 12 m9 m

-----3

---335

--35510

--551015

-35101015

-35101520

-510101525

3510152025

31010152030

Oxygen 6 m 5 15 20 30 40 45 55 60 70Total decompression 0h11 0h29 0h46 1h08 1h25 1h40 2h02 2h20 2h40

Depth : 45 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120Ascent to stop 2 2 2

24 m21 m

Heliox 18 m15 m

24-26% 12 m9 m

31010152535

31015202540

51015203040

Oxygen 6 m 80 85 95Total decompression 3h00 3h20 3h37

-108-

HELIOX/OXY/6M TABLES

Depth : 48 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 3 2 2 2 2

24 m21 m

Heliox 18 m15 m

24-26% 12 m9 m

----33

--3355

--35510

-3551015

-55101020

3510101520

3510152025

51010152030

51010152535

Oxygen 6 m 5 15 25 35 40 50 60 70 75Total decompression 0h14 0h34 0h51 1h16 1h33 1h55 2h20 2h42 2h57

Depth : 48 metres Heliox 24-26 % oxygenDepth time (min) 100 110Ascent to stop 2 2

27 m24 m21 m

Heliox 18 m24-26% 15 m

12 m9 m

351015202540

3101015203045

Oxygen 6 m 85 95Total decompression 3h25 3h50

Depth : 51 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 4 3 3 3 3 3 2 2 2

27 m24 m21 m

Heliox 18 m24-26% 15 m

12 m9 m

-----33

---3355

--3351010

-335101015

-355101520

-5510101525

351010152030

351010152535

3101015202540

Oxygen 6 m 10 15 25 35 45 55 65 75 85Total decompression 0h20 0h34 0h59 1h24 1h46 2h08 2h40 3h00 3h30

-109-

HELIOX/OXY/6M TABLES

Depth : 51 metres Heliox 24-26 % oxygenDepth time (min) 100Ascent to stop 2

27 m24 m21 m

Heliox 18 m24-26% 15 m

12 m9 m

5101015203045

Oxygen 6 m 95Total decompression 3h52

Depth : 30 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 15 m22-24% 12 m

9 m

---

--3

--5

-35

-310

-510

-1015

31015

31020

Oxygen 6 m 3 10 15 15 20 25 30 35 40Total decompression 0h06 0h15 0h22 0h25 0h35 0h42 0h57 1h05 1h15

Depth : 30 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 15 m22-24% 12 m

9 m

31520

31520

51525

51525

Oxygen 6 m 45 50 55 60Total decompression 1h25 1h30 1h42 1h47

Depth : 33 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 15 m22-24% 12 m

9 m

---

--3

-35

-510

3510

31015

51015

51020

101520

Oxygen 6 m 3 10 15 20 25 30 35 40 45Total decompression 0h06 0h15 0h25 0h37 0h45 1h00 1h07 1h17 1h32

-110-

HELIOX/OXY/6M TABLES

Depth : 33 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

18 mHeliox 15 m22-24% 12 m

9 m

-101525

3101525

3152030

3152030

Oxygen 6 m 50 60 65 70Total decompression 1h42 1h55 2h15 2h20

Depth : 36 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2

18 mHeliox 15 m22-24% 12 m

9 m

----

--35

-355

-3510

-51015

351015

3101020

3101520

5101525

Oxygen 6 m 5 10 15 25 30 35 40 45 55Total decompression 0h08 0h20 0h30 0h45 1h02 1h10 1h25 1h35 1h52

Depth : 36 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

18 mHeliox 15 m22-24% 12 m

9 m

5102025

5152030

10152035

10152535

Oxygen 6 m 60 65 70 80Total decompression 2h02 2h17 2h32 2h47

Depth : 39 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2

21 mHeliox 18 m

15 m22-24% 12 m

9 m

----3

---35

--3510

-35510

-351015

-5101020

-5101520

310101525

310152030

Oxygen 6 m 5 10 20 25 30 40 45 55 60Total decompression 0h11 0h21 0h40 0h50 1h05 1h27 1h37 2h00 2h20

-111-

HELIOX/OXY/6M TABLES

Depth : 39 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

21 m18 m

Heliox 15 m22-24% 12 m

9 m

310152030

310152535

515202540

515203040

Oxygen 6 m 65 75 80 90Total decompression 2h25 2h45 3h07 3h22

Depth : 42 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2

21 m18 m

Heliox 15 m22-24% 12 m

9 m

----3

--335

-35510

-351015

35101015

35101520

310101525

510152025

510152030

Oxygen 6 m 5 15 20 30 35 45 50 60 70Total decompression 0h11 0h29 0h45 1h05 1h20 1h40 1h55 2h17 2h32

Depth : 42 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

24 m21 m18 m

Heliox 15 m22-24% 12 m

9 m

31010152535

31015202540

31015203045

31015253045

Oxygen 6 m 75 85 90 100Total decompression 2h55 3h20 3h35 3h50

Depth : 45 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2

24 m21 m18 m

Heliox 15 m22-24% 12 m

9 m

----33

---355

--35510

-3551015

-35101020

-510101520

3510152025

31010152030

51010152535

Oxygen 6 m 5 15 25 30 40 50 60 65 75Total decompression 0h14 0h31 0h51 1h10 1h30 1h52 2h20 2h35 2h57

-112-

HELIOX/OXY/6M TABLES

Depth : 45 metres Heliox 22-24 % oxygenDepth time (min) 100 110Ascent to stop 2 2

24 m21 m18 m

Heliox 15 m22-24% 12 m

9 m

51015202540

51015203045

Oxygen 6 m 85 95Total decompression 3h22 3h42

Depth : 48 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2

27 m24 m

Heliox 21 m22-24% 18 m

15 m12 m

9 m

-----33

---3355

--3351010

--35101015

-355101520

-3510101525

-51010152030

351010152535

3101015202540

Oxygen 6 m 10 15 25 35 45 55 65 75 85Total decompression 0h19 0h34 0h59 1h21 1h45 2h05 2h37 3h00 3h30

Depth : 48 metres Heliox 22-24 % oxygenDepth time (min) 100Ascent to stop 2

27 m24 m21 m

Heliox 18 m22-24% 15 m

12 m9 m

3101015203045

Oxygen 6 m 95Total decompression 3h50

-113-

HELIOX/OXY/6M TABLES

Depth : 51 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 4 3 3 3 3 2 2 2 2

27 m24 m21 m

Heliox 18 m22-24% 15 m

12 m9 m

-----33

---33510

--3551010

-355101015

-5510101520

35510152025

351010152535

5101015202540

5101015203045

Oxygen 6 m 10 20 30 40 50 60 70 80 90Total decompression 0h20 0h44 1h06 1h31 1h58 2h25 2h55 3h27 3h47

Depth : 54 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 4 3 3 3 3 3 2 2 2

30 m27 m24 m

Heliox 21 m18 m

22-24% 15 m12 m

9 m

-----333

---335510

--33551015

-3355101520

-35510101525

-551010152030

3551015202535

35101015203040

310101515253545

Oxygen 6 m 10 20 30 40 55 65 75 90 100Total decompression 0h23 0h49 1h14 1h44 2h11 2h43 3h15 3h45 4h20

Depth : 30 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 2 2 2 2 2 2 2 2 2Heliox 15 m20-22% 12 m

9 m

---

--3

-35

-310

-510

31010

31015

31015

51520

Oxygen 6 m 3 10 15 20 25 30 35 40 45Total decompression 0h05 0h15 0h25 0h35 0h42 0h55 1h05 1h10 1h27

Depth : 30 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2Heliox 15 m20-22% 12 m

9 m

51520

51525

102025

102030

Oxygen 6 m 50 55 60 65Total decompression 1h32 1h42 1h57 2h07

-114-

HELIOX/OXY/6M TABLES

Depth : 33 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2

18 mHeliox 15 m20-22% 12 m

9 m

----

---3

--35

-3510

-31010

-51015

-51020

-101520

3101525

Oxygen 6 m 3 10 15 20 25 35 40 45 50Total decompression 0h06 0h15 0h25 0h40 0h50 1h07 1h17 1h32 1h45

Depth : 33 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

18 mHeliox 15 m20-22% 12 m

9 m

3101525

3152030

5152030

5152535

Oxygen 6 m 55 60 70 75Total decompression 1h50 2h10 2h22 2h37

Depth : 36 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2

18 mHeliox 15 m20-22% 12 m

9 m

---3

--35

-3510

-3510

351015

3101015

3101520

5101525

5102025

Oxygen 6 m 5 10 15 25 30 35 45 50 55Total decompression 0h11 0h20 0h35 0h45 1h05 1h15 1h35 1h47 1h57

Depth : 36 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

21 m18 m

Heliox 15 m20-22% 12 m

9 m

-10152030

310152535

310152535

315202540

Oxygen 6 m 65 70 75 85Total decompression 2h22 2h40 2h45 3h10

-115-

HELIOX/OXY/6M TABLES

Depth : 39 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2

21 m18 m

Heliox 15 m20-22% 12 m

9 m

----3

--335

--3510

-351010

-351015

-5101520

310101525

310152025

510152030

Oxygen 6 m 5 15 20 25 35 40 50 55 65Total decompression 0h11 0h28 0h40 0h55 1h10 1h32 1h55 2h10 2h27

Depth : 39 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

21 m18 m

Heliox 15 m20-22% 12 m

9 m

510152535

515202540

1015203040

1015203045

Oxygen 6 m 70 80 90 95Total decompression 2h42 3h07 3h27 3h37

Depth : 42 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2

24 m21 m18 m

Heliox 15 m20-22% 12 m

9 m

-----3

---335

--35510

--551015

-35101020

-35101520

-510152025

3510152030

31010152535

Oxygen 6 m 5 15 20 30 40 45 55 65 75Total decompression 0h11 0h29 0h45 1h07 1h30 1h40 2h12 2h30 2h55

Depth : 42 metres Heliox 20-22 % oxygenDepth time (min) 100 110Ascent to stop 2 2

24 m21 m18 m

Heliox 15 m20-22% 12 m

9 m

31015202540

31015203045

Oxygen 6 m 80 90Total decompression 3h15 3h35

-116-

HELIOX/OXY/6M TABLES

Depth : 45 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2

24 m21 m18 m

Heliox 15 m20-22% 12 m

9 m

----33

--3355

-3351010

-3551015

355101520

3510101525

31010152030

51010152535

51015202540

Oxygen 6 m 5 15 25 35 45 50 60 70 80Total decompression 0h14 0h34 0h58 1h15 1h45 2h00 2h30 2h52 3h17

Depth : 45 metres Heliox 20-22 % oxygenDepth time (min) 100Ascent to stop 2

27 m24 m21 m18 m

Heliox 15 m20-22% 12 m

9 m

3101015203045

Oxygen 6 m 90Total decompression 3h45

Depth : 48 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2

27 m24 m21 m18 m

Heliox 15 m20-22% 12 m

9 m

-----33

---33510

--3551015

-355101020

-3510101525

-5510152030

351010152535

351015202540

5101015203045

Oxygen 6 m 10 15 25 35 50 60 70 80 90Total decompression 0h19 0h39 1h06 1h30 2h00 2h27 2h55 3h20 3h47

-117-

HELIOX/OXY/6M TABLES

Depth 51 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2

30 m27 m24 m

Heliox 21 m18 m

20-22% 15 m12 m

9 m

-----333

---333510

--33551015

--355101520

-35510101525

-351010152030

-551015202535

35101015203045

35101520253550

Oxygen 6 m 10 20 30 40 50 65 75 85 100Total decompression 0h22 0h47 1h14 1h41 2h05 2h40 3h12 3h45 4h25

Depth : 54 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80Ascent to stop 4 3 3 3 3 2 2 2

30 m27 m24 m

Heliox 21 m18 m

20-22% 15 m12 m

9 m

-----335

---335510

--33551015

-35510101520

-35510152030

3551010152535

35101015203040

55101515253545

Oxygen 6 m 10 20 35 45 55 70 85 95Total decompression 0h25 0h49 1h19 1h56 2h26 3h00 3h40 4h12

Depth : 57 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80Ascent to stop 4 3 3 3 3 3 2 2

33 m30 m27 m24 m

Heliox 21 m20-22% 18 m

15 m12 m

9 m

------335

---3335510

--3355101015

-335510101525

-3551010152030

-55101015202535

355101015203045

3510101520253550

Oxygen 6 m 10 25 35 50 65 75 90 105Total decompression 0h25 0h57 1h29 2h09 2h46 3h23 3h55 4h40

-118-

HELIOX/OXY/6M TABLES

Depth : 60 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70Ascent to stop 4 3 3 3 3 3 3

33 m30 m27 m24 m

Heliox 21 m20-22% 18 m

15 m12 m

9 m

-----3335

---33351010

--3355101520

-355510152025

35551010152535

355101015203040

5510101520253550

Oxygen 6 m 10 25 40 55 70 85 100Total decompression 0h28 1h02 1h44 2h26 3h06 3h46 4h38

Depth : 36 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 21 m18-20% 18 m

15 m12 m

9 m

----3

---35

--3510

--51010

-351015

-3101520

-5101525

-10102025

310152030

Oxygen 6 m 5 10 20 25 30 40 45 55 60Total decompression 0h11 0h20 0h40 0h52 1h05 1h30 1h42 2h02 2h20

Depth : 36 metres Heliox 18-20 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 21 m18-20% 18 m

15 m12 m

9 m

310152535

310202540

515203040

515203045

Oxygen 6 m 70 75 85 90Total decompression 2h40 2h55 3h17 3h27

-119-

HELIOX/OXY/6M TABLES

Depth : 39 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 21 m18-20% 18 m

15 m12 m

9 m

----3

--335

-35510

-351015

-5101020

35101520

310102025

510152030

510152535

Oxygen 6 m 5 15 20 30 35 45 55 60 70Total decompression 0h11 0h28 0h45 1h05 1h22 1h40 2h05 2h22 2h42

Depth : 39 metres Heliox 18-20 % oxygenDepth time (min) 100 110 120Ascent to stop 2 2

24 mHeliox 21 m18-20% 18 m

15 m12 m

9 m

-1015202540

31015203045

31015253550

Oxygen 6 m 80 85 95Total decompression 3h12 3h30 3h55

Depth : 42 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2

24 mHeliox 21 m18-20% 18 m

15 m12 m

9 m

----33

---355

--35510

-3551015

-35101520

-510101525

3510152030

31010152535

51015202540

Oxygen 6 m 5 15 25 30 40 50 60 70 80Total decompression 0h14 0h31 0h50 1h10 1h35 1h57 2h25 2h50 3h17

Depth : 42 metres Heliox 18-20 % oxygenDepth time (min) 100 110Ascent to stop 2 2

24 mHeliox 21 m18-20% 18 m

15 m12 m

9 m

51015203045

51015253550

Oxygen 6 m 90 95Total decompression 3h37 3h57

-120-

HELIOX/OXY/6M TABLES

Depth : 45 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2

27 m24 m

Heliox 21 m18-20% 18 m

15 m12 m

9 m

-----33

---33510

--3551015

--35101020

-3510101525

-3510152030

-51010152535

351015202540

3101015203045

Oxygen 6 m 10 15 25 35 45 55 65 75 85Total decompression 0h19 0h39 1h05 1h25 1h55 2h20 2h47 3h15 3h40

Depth : 45 metres Heliox 18-20 % oxygenDepth time (min) 100Ascent to stop 2

27 m24 m

Heliox 21 m18-20% 18 m

15 m12 m

9 m

3101520253550

Oxygen 6 m 100Total decompression 4h20

Depth : 48 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2

27 m24 m

Heliox 21 m18-20% 18 m

15 m12 m

9 m

-----33

---33510

--3551015

-355101520

-5510102025

351010152030

351015202540

5101015203045

5101520253550

Oxygen 6 m 10 20 30 40 50 65 75 85 95Total decompression 0h19 0h44 1h11 1h40 2h07 2h40 3h15 3h42 4h17

-121-

HELIOX/OXY/6M TABLES

Depth : 51 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80Ascent to stop 3 3 3 2 2 2 2 2

30 m27 m24 m

Heliox 21 m18-20% 18 m

15 m12 m

9 m

-----333

---335510

--33551015

-35510101520

-35510152030

-551015152535

35101015203040

35101520253550

Oxygen 6 m 10 20 30 45 55 70 80 95Total decompression 0h22 0h49 1h14 1h55 2h25 3h02 3h35 4h20

Depth : 54 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70Ascent to stop 4 3 3 3 2 2 2

30 m27 m24 m

Heliox 21 m18-20% 18 m

15 m12 m

9 m

-----335

---335510

-3355101015

-35510101525

3551010152030

35101015202540

55101515253045

Oxygen 6 m 10 20 35 50 60 75 90Total decompression 0h25 0h49 1h29 2h06 2h40 3h25 4h02

Depth : 57 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70Ascent to stop 4 3 3 3 3 2 2

33 m30 m27 m24 m

Heliox 21 m18-20% 18 m

15 m12 m

9 m

-----3335

---33351010

--3355101520

-355510152025

-3551010152535

355101015203045

3510101520253550

Oxygen 6 m 10 25 40 55 70 85 100Total decompression 0h28 1h02 1h44 2h26 3h01 3h50 4h35

-122-

HELIOX/OXY/6M TABLESDepth : 60 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60Ascent to stop 4 3 3 3 3 2

36 m33 m30 m

Heliox 27 m18-20% 24 m

21 m18 m15 m12 m

9 m

------3335

----33551015

--33555101520

-33551010152030

-355101015202540

35510101515253045

Oxygen 6 m 10 25 40 60 75 90Total decompression 0h28 1h09 1h49 2h44 3h31 4h15

Depth : 63 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60Ascent to stop 4 3 3 3 3 3

36 m33 m30 m

Heliox 27 m18-20% 24 m

21 m18 m15 m12 m

9 m

-----33335

---333551015

--335510101525

-33551010152030

3555101015203040

35510101520253550

Oxygen 6 m 15 30 45 65 80 100Total decompression 0h36 1h17 2h04 2h49 3h46 4h41

Depth : 66 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50Ascent to stop 4 3 3 3 3

36 m33 m30 m

Heliox 27 m18-20% 24 m

21 m18 m15 m12 m

9 m

-----33355

--3333551015

-3335510101525

335551015152535

3555101015203045

Oxygen 6 m 15 30 50 70 90Total decompression 0h38 1h20 2h12 3h14 4h01

-123-

HELIOX/OXY/6M TABLES

Depth : 69 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50Ascent to stop 4 4 3 3 3

39 m36 m33 m30 m

Heliox 27 m18-20% 24 m

21 m18 m15 m12 m

9 m

------33355

---33355101015

-33355510152025

-3355101015202540

355510101520253550

Oxygen 6 m 15 35 55 75 95Total decompression 0h38 1h33 2h32 3h34 4h41

-124-

2 - HELIOX/OXY/12 M

2.1 - Heliox/Oxy/12 M Tables

Set of decompression tables for bounce dives todepths ranging from 30 to 78 metres.

The post-dive interval following a dive using aHeliox/Oxy/12 m table is 12 hours minimum. Norepetitive dive is allowed during this intervalregardless of breathing mixture.

2.2 - Diving Methods

Wet-bell diving only. During decompression in wet-bell, two divers must be present and must besecured in order to avoid accidental headsubmersion.

2.3 - Decompression Procedures

• Rate of ascent to first stop between 9 and 15m/min,

• In-water decompression with stops each 3metres up to 6 metres,

• The last minute of decompression stop durationused to ascend to next stop level,

• At the end of decompression, the diver ascendsdirectly from the 6 m stop to the surface in oneminute.

2.4 - Dive Mix

2.4.1 - Bottom Mix

Bottom mix is a heliox mix with an oxygenpercentage ranging from 0.850 bar (850 hPa) to1.550 bar (1550 hPa) at working depth of diver.

2.4.2 - Decompression Mix

• Ascent to first stop is made with heliox bottommix at whatever depth is this first stop made,

• For stops deeper than 30 m, the diver breathesheliox bottom mix,

• For stops between 30 m and 12 m, the diverbreathes air or bottom mix with an oxygenpercentage higher than 21 %,

• For stops between 12 m and the surface, thediver breathes oxygen at the mask usingfollowing protocol : 25 min oxygen breathing onmask followed by 5 min breathing ambient air inwet-bell dome and so on. If wet-bell was filledwith bottom mix, it must be ventilated with air forstops starting at 12 metres.

2.5 - Contingency Procedures

Exceeding the planned bottom time

• Use either the next bottom time or the back-upbottom time.

Difficult dive conditions

• Play safe and, in the table, use the timeimmediately above the one corresponding tothe time actually spent.

Oxygen supply failure

• Use a heliox/oxy/6 m table for 12 m and 9 mstops if bottom time allows it,

• Or multiply by 2 the oxygen stops times andperform them on heliox 20/80 or on air.

-125-

TABLE N°2

BOTTOM MIXES FOR HELIOX/OXY/12M TABLES

DiveDepth

Oxygen percentage in the heliox bottom mix

(m)26.0-27.9% 24.0-25.9% 22.0-23.9% 20.0-21.9% 18.0-19.9% 17.0-17.9%

30

33

36

39

42

45

48

51

54

57

60

63

66

69

72

75

78

81

-126-

HELIOX/OXY/12 M TABLESDepth : 30 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox26-28% 15 m - - - - - - - - -Oxygen

12 m9 m6 m

Oxy Air

--3

Oxy Air

-35

Oxy Air

555

Oxy Air

1055

Oxy Air

10105

Oxy Air

1015+55

Oxy Air

1015+510

Oxy Air

1015+513

Oxy Air

1015+523

Total decompression 0h06 0h10 0h17 0h22 0h27 0h42 0h42 0h45 0h55

Depth : 30 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox26-28% 15 m - - - -Oxygen

12 m9 m6 m6 m

Oxy Air

1015+525+55

Oxy Air

1015+525+55

Oxy Air

1015+525+510

Oxy Air

1015+525+515

Total decompression 1h07 1h07 1h12 1h17

Depth : 33 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 18 m26-28% 15 m

--

--

--

--

--

--

-3

-3

-3

Oxygen12 m

9 m6 m6 m

Oxy Air

--3-

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Total decompression 0h06 0h13 0h22 0h27 0h42 0h42 0h50 1h00 1h10

Depth : 33 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m26-28% 15 m

-3

-5

-5

-5

Oxygen12 m

9 m6 m6 m

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

1015+525+525

Oxy Air

25+525+525+55

Total decompression 1h10 1h27 1h32 1h42

-127-

HELIOX/OXY/12 M TABLESDepth : 36 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 18 m26-28% 15 m

--

--

--

--

-3

-3

-5

-5

-10

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

335-

Oxy Air

10105-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+510

Total decompression 0h11 0h14 0h27 0h27 0h45 0h50 1h02 1h12 1h22Depth : 36 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m26-28% 15 m

310

310

310

315

Oxygen12 m

9 m6 m6 m

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Oxy Air

25+525+525+510

Oxy Air

25+525+525+515

Total decompression 1h35 1h50 1h55 2h05Depth : 39 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 18 m26-28% 15 m

--

--

-3

-3

-5

35

310

310

510

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

555-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525+55

Oxy Air

1015+525+510

Oxy Air

1015+525+525

Total decompression 0h11 0h18 0h30 0h45 0h47 1h00 1h20 1h25 1h42Depth : 39 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 3 2 2Heliox 18 m26-28% 15 m

510

515

1015

1015

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Total decompression 1h52 2h07 2h12 2h37

-128-

HELIOX/OXY/12 M TABLES

Depth : 42 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2Heliox 21 m26-28% 18 m

15 m

---

---

--3

-35

-35

-510

-510

3510

31010

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525-

Oxy Air

1015+525+510

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Total decompression 0h14 0h23 0h31 0h50 1h00 1h12 1h27 1h40 2h00

Depth : 42 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 21 m26-28% 18 m

15 m

31015

31015

51015

51520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Oxy Air

25+525+525+525+515

Total decompression 2h15 2h15 2h42 2h57

Depth : 45 metres Heliox 26-28 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2Heliox 21 m26-28% 18 m

15 m

---

--3

-33

-35

355

3510

3510

51010

51015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

10105-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Total decompression 0h14 0h31 0h34 0h51 1h10 1h25 1h40 2h02 2h17

-129-

HELIOX/OXY/12 M TABLES

Depth : 45 metres Heliox 26-28 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

24 mHeliox 21 m26-28% 18 m

15 m

-101015

3101015

3101520

3101520

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 2h22 2h50 3h05 3h25

Depth : 30 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox24-26% 15 m - - - - - - - - -Oxygen

12 m9 m6 m

Oxy Air

--3

Oxy Air

-35

Oxy Air

555

Oxy Air

1055

Oxy Air

10105

Oxy Air

1015+510

Oxy Air

1015+510

Oxy Air

1015+520

Oxy Air

1015+525

Total decompression 0h06 0h10 0h17 0h22 0h27 0h42 0h42 0h52 0h57

Depth : 30 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stopHeliox24-26% 15 mOxygen

12 m9 m6 m6 m

Oxy Air

1015+525+55

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

1015+525+525

Total decompression 1h10 1h10 1h25 1h30

-130-

HELIOX/OXY/12 M TABLES

Depth : 33 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox24-26% 15 m - - - - - 3 3 3 5Oxygen

12 m9 m6 m6 m

Oxy Air

-35-

Oxy Air

335-

Oxy Air

10105-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+520-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Total decompression 0h11 0h13 0h27 0h27 0h42 0h45 0h55 1h00 1h12Depth : 33 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox24-26% 15 m 5 10 10 10Oxygen

12 m9 m6 m6 m

Oxy Air

1015+525+515

Oxy Air

1015+525+525

Oxy Air

25+525+525+55

Oxy Air

25+525+525+510

Total decompression 1h22 1h37 1h47 1h52Depth : 36 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 18 m24-26% 15 m

--

--

--

-3

-3

-5

-5

310

310

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

335-

Oxy Air

10105-

Oxy Air

1015+55-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Total decompression 0h11 0h14 0h27 0h40 0h45 0h57 1h02 1h20 1h35Depth : 36 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m24-26% 15 m

310

510

515

515

Oxygen12 m

9 m6 m6 m

Oxy Air

1015+525+525

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Oxy Air

25+525+525+515

Total decompression 1h40 1h52 2h07 2h07

-131-

HELIOX/OXY/12 M TABLES

Depth : 39 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 18 m24-26% 15 m

--

--

-3

-3

35

35

510

510

510

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+510-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

1015+525+525

Total decompression 0h11 0h23 0h30 0h45 0h50 1h05 1h22 1h37 1h42HELIOX/OXY/12 M TABLES

Depth : 39 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 21 m24-26% 18 m

15 m

31015

31015

31015

31015

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525-

Oxy Air

25+525+525+525+510

Total decompression 2h05 2h15 2h25 2h40

Depth : 42 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2Heliox 21 m24-26% 18 m

15 m

---

---

--3

-35

-35

3510

3510

31010

51015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525+55

Oxy Air

1015+525+515

Oxy Air

1015+525+525

Oxy Air

25+525+525+55

Total decompression 0h14 0h23 0h31 0h50 1h00 1h25 1h35 1h50 2h07

-132-

HELIOX/OXY/12 M TABLES

Depth : 42 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 21 m24-26% 18 m

15 m

51015

51015

101520

101520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Oxy Air

25+525+525+525+515

Oxy Air

25+525+525+525+525

Total decompression 2h17 2h42 3h02 3h12

Depth : 45 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2

24 mHeliox 21 m24-26% 18 m

15 m

----

---3

--35

--55

-3510

-3510

-51010

351015

3101015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

10105-

Oxy Air

1015+55-

Oxy Air

1015+510-

Oxy Air

1015+525-

Oxy Air

1015+525+510

Oxy Air

1015+525+525

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Total decompression 0h14 0h31 0h46 0h53 1h15 1h30 1h52 2h10 2h25

Depth : 45 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

24 mHeliox 21 m24-26% 18 m

15 m

3101015

3101520

5101520

5101525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+5-25+525+525

Oxy Air

25+525+525+525+525+510

Total decompression 2h50 3h05 3h17 3h37

-133-

HELIOX/OXY/12 M TABLESDepth : 48 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 3 2 2 2 2

24 mHeliox 21 m24-26% 18 m

15 m

----

---3

--35

-355

-5510

351010

351015

5101015

5101515

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+520--

Oxy Air

1015+525+55-

Oxy Air

1015+525+520-

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+55

Total decompression 0h18 0h31 0h51 1h06 1h28 1h50 2h10 2h27 2h52

Depth : 48 metres Heliox 24-26 % oxygenDepth time (min) 100 110 120Ascent to stop 2 2 2

27 m24 m

Heliox 21 m24-26% 18 m

15 m

-5101520

310101520

310151525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Oxy Air

25+525+525+525+525+510

Total decompression 3h07 3h35 3h50

Depth : 51 metres Heliox 24-26 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 4 3 3 3 3 3 2 2 2

27 m24 m

Heliox 21 m24-26% 18 m

15 m

-----

---33

--335

-35510

-35510

-551010

35101015

35101015

310101520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+525--

Oxy Air

1015+525+510-

Oxy Air

1015+525+525-

Oxy Air

25+525+525+510-

Oxy Air

25+525+525+525-

Oxy Air

25+525+525+525+515

Total decompression 0h19 0h34 0h54 1h21 1h36 1h58 2h25 2h40 3h15

-134-

HELIOX/OXY/12 M TABLES

Depth : 51 metres Heliox 24-26 % oxygenDepth time (min) 100 110Ascent to stop 2 2

27 m24 m

Heliox 21 m24-26% 18 m

15 m

510101520

510151525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+525+525+525+55

Oxy Air

25+525+525+525+525+515

Total decompression 3h37 3h57

Depth : 30 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox22-24% 15 m - - - - - - - 3 3Oxygen

12 m9 m6 m6 m

Oxy Air

--3-

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+520-

Oxy Air

1015+525+55

Total decompression 0h06 0h13 0h22 0h27 0h42 0h42 0h47 0h55 1h10

Depth : 30 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox22-24% 15 m 3 3 5 5Oxygen

12 m9 m6 m6 m

Oxy Air

1015+525+55

Oxy Air

1015+525+515

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Total decompression 1h10 1h20 1h27 1h42

-135-

HELIOX/OXY/12 M TABLES

Depth : 33 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 18 m22-24% 15 m

--

--

--

--

-3

-3

-5

-5

-10

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

335-

Oxy Air

10105-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+510-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+55

Total decompression 0h11 0h13 0h27 0h27 0h45 0h45 1h02 1h12 1h17Depth : 33 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m22-24% 15 m

-10

310

315

315

Oxygen12 m

9 m6 m6 m

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Total decompression 1h32 1h50 1h55 2h05Depth : 36 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 18 m22-24% 15 m

--

--

-3

-3

-5

35

310

310

510

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

555-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525+55

Oxy Air

1015+525+510

Oxy Air

1015+525+520

Total decompression 0h11 0h17 0h30 0h45 0h47 1h00 1h20 1h25 1h37Depth : 36 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m22-24% 15 m

510

515

1015

1015

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+510-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+55

Total decompression 1h52 2h02 2h12 2h32

-136-

HELIOX/OXY/12 M TABLES

Depth : 39 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 21 m22-24% 18 m

15 m

---

---

--3

-35

-35

-510

-510

31010

31015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Total decompression 0h14 0h23 0h30 0h50 1h00 1h12 1h22 1h45 2h05

Depth : 39 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 21 m22-24% 18 m

15 m

31015

31015

51520

51520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Oxy Air

25+525+525+525+515

Total decompression 2h15 2h15 2h52 2h57

Depth : 42 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 21 m22-24% 18 m

15 m

---

--3

-35

-35

3510

3510

31010

51015

51015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

10105-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Total decompression 0h14 0h31 0h35 0h50 1h15 1h25 1h45 2h07 2h17

-137-

HELIOX/OXY/12 M TABLES

Depth : 42 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2

24 mHeliox 21 m22-24% 18 m

15 m

3101015

3101520

3101520

3101525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+520-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 2h30 3h00 3h05 3h30

Depth : 45 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2

24 mHeliox 21 m22-24% 18 m

15 m

----

---3

--35

-355

-3510

-51010

351015

3101015

5101015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+525+55

Oxy Air

1015+525+510

Oxy Air

1015+525+525

Oxy Air

25+525+525+510

Oxy Air

25+525+525+520

Total decompression 0h14 0h31 0h51 1h00 1h25 1h37 2h00 2h20 2h32

Depth : 45 metres Heliox 22-24 % oxygenDepth time (min) 100 110 120Ascent to stop 2 2 2

24 mHeliox 21 m22-24% 18 m

15 m

5101520

5101520

10101525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+520

Oxy Air

25+525+525+525+525+55

Total decompression 3h02 3h12 3h37

-138-

HELIOX/OXY/12 M TABLESDepth : 48 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2

27 m24 m

Heliox 21 m22-24% 18 m

15 m

-----

---33

--335

--3510

-35510

-351010

-5101015

35101015

310101520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+520--

Oxy Air

1015+525+55-

Oxy Air

1015+525+525-

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Total decompression 0h18 0h34 0h54 1h11 1h30 1h55 2h17 2h30 3h10Depth : 48 metres Heliox 22-24 % oxygenDepth time (min) 100 110Ascent to stop 2 2

27 m24 m

Heliox 21 m22-24% 18 m

15 m

310101520

310152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+520

Oxy Air

25+525+525+525+525+510

Total decompression 3h20 3h55Depth : 51 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 4 3 3 3 3 2 2 2 2

27 m24 m

Heliox 21 m22-24% 18 m

15 m

-----

---33

--355

-35510

-551010

3551015

35101015

510101520

510101520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+525--

Oxy Air

1015+525+510-

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Oxy Air

25+525+525+525+515

Total decompression 0h19 0h34 0h56 1h21 1h43 2h15 2h30 3h12 3h17

-139-

HELIOX/OXY/12 M TABLES

Depth : 51 metres Heliox 22-24 % oxygenDepth time (min) 100Ascent to stop 2

30 m27 m

Heliox 24 m21 m

22-24% 18 m15 m

3510152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+525+525+525+55

Total decompression 3h55

Depth : 54 metres Heliox 22-24 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 4 3 3 3 3 3 2 2 2

30 m27 m

Heliox 24 m21 m

22-24% 18 m15 m

-----3

---335

--3355

-335510

-3551010

-55101015

355101520

3510101520

31010151525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1010-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25+55-

Oxy Air

1015+5-25+525-

Oxy Air

25+525+5-25+510-

Oxy Air

25+525+5-25+525+55

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 0h22 0h39 0h59 1h34 2h01 2h28 3h05 3h20 3h55

-140-

HELIOX/OXY/12 M TABLES

Depth : 30 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 2 2 2 2 2 2 2 2 2Heliox 18 m20-22% 15 mou Air

--

--

--

--

--

-3

-3

-3

-5

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

335-

Oxy Air

10105-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Total decompression 0h10 0h13 0h27 0h27 0h42 0h45 0h50 1h00 1h12

Depth : 30 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m20-22% 15 mou Air

-5

-5

-10

-10

Oxygen12 m

9 m6 m6 m

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Oxy Air

25+525+525+55

Total decompression 1h12 1h27 1h47 1h47

Depth : 33 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 18 m20-22% 15 mou Air

--

--

--

-3

-3

-5

-5

-10

310

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

335-

Oxy Air

10105-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+515

Total decompression 0h11 0h13 0h27 0h30 0h45 0h52 1h02 1h17 1h30

-141-

HELIOX/OXY/12 M TABLES

Depth : 33 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 18 m20-22% 15 mou Air

310

315

515

515

Oxygen12 m

9 m6 m6 m

Oxy Air

1015+525+525

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Oxy Air

25+525+525+515

Total decompression 1h40 1h55 2h07 2h07

Depth : 36 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2Heliox 18 m20-22% 15 mou Air

--

--

-3

-3

35

310

310

510

510

Oxygen12 m

9 m6 m6 m

Oxy Air

-35-

Oxy Air

555-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+510-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+515

Oxy Air

1015+525+525

Total decompression 0h11 0h17 0h30 0h45 0h50 1h10 1h20 1h32 1h42

Depth : 36 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 21 m20-22%

- 3 3 3

Heliox 18 m20-22% 15 mou Air

1015

1015

1015

1520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525-

Oxy Air

25+525+525+525+510

Total decompression 2h02 2h15 2h25 2h50

-142-

HELIOX/OXY/12 M TABLES

Depth : 39 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 21 m20-22%

- - - - - - 3 3 5

Heliox 18 m20-22% 15 mou Air

--

-3

-3

35

35

510

1010

1015

1015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525+55

Oxy Air

1015+525+515

Oxy Air

1015+525+525

Oxy Air

25+525+525+55

Total decompression 0h14 0h25 0h30 0h50 1h00 1h22 1h40 1h55 2h07

Depth : 39 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 21 m20-22%

5 5 10 10

Heliox 18 m20-22% 15 mou Air

1015

1520

1520

1520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Oxy Air

25+525+525+525+515

Oxy Air

25+525+525+525+525

Total decompression 2h17 2h52 3h02 3h12

Depth : 42 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 24 m20-22%

- - - - - - - 3 3

Heliox 21 m20-22% 18 mou Air 15 m

---

--3

-35

-55

3510

2510

51015

51015

101015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

10105-

Oxy Air

1015+55-

Oxy Air

1015+510-

Oxy Air

1015+525-

Oxy Air

1015+525+510

Oxy Air

1015+525+525

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Total decompression 0h14 0h31 0h45 0h52 1h15 1h30 1h57 2h10 2h25

-143-

HELIOX/OXY/12 M TABLESDepth : 42 metres Heliox 20-22 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 24 m20-22%

3 3 5 5

Heliox 21 m20-22% 18 mou Air 15 m

101520

101520

101525

152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Oxy Air

25+525+525+525+525+510

Total decompression 3h00 3h05 3h32 3h47Depth : 45 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 24 m20-22%

- - - - 3 3 3 5 5

Heliox 21 m20-22% 18 mou Air 15 m

---

-33

335

355

5510

51010

101015

101015

101520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+520--

Oxy Air

1015+525+55-

Oxy Air

1015+525+520-

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Total decompression 0h18 0h34 0h53 1h05 1h30 1h50 2h15 2h27 3h02Depth : 45 metres Heliox 20-22 % oxygenDepth time (min) 100 110Ascent to stop 2 2Heliox 27 m20-22% 24 m

310

310

Heliox 21 m20-22% 18 mou Air 15 m

101520

151525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 3h15 3h45

-144-

HELIOX/OXY/12 M TABLES

Depth : 48 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2Heliox 27 m20-22%

- - - - - - 3 3 5

24 mHeliox 21 m20-22% 18 mou Air 15 m

----

--33

-355

35510

351010

551015

5101015

5101520

10101520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+525--

Oxy Air

1015+525+510-

Oxy Air

1015+525+525-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+55

Oxy Air

25+525+525+525+515

Total decompression 0h18 0h34 0h56 1h20 1h40 2h02 2h30 3h00 3h17

Depth : 48 metres Heliox 20-22 % oxygenDepth time (min) 100 110Ascent to stop 2 2Heliox 27 m20-22%

5 5

24 mHeliox 21 m20-22% 18 mou Air 15 m

10152025

10152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+525+525+525+55

Oxy Air

25+525+525+525+525+520

Total decompression 3h52 4h07

-145-

HELIOX/OXY/12 M TABLES

Depth : 51 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 3 2 2 2 2 2Heliox 30 m20-22% 27 m

--

--

--

--

-3

-3

-5

35

35

24 mHeliox 21 m20-22% 18 mou Air 15 m

---3

-333

3355

35510

551010

5101015

5101520

10101520

10152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1010-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25+55-

Oxy Air

1015+5-25+520-

Oxy Air

25+525+5-25+55-

Oxy Air

25+525+5-25+520-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 0h21 0h37 0h59 1h31 1h55 2h20 2h47 3h20 3h55

Depth : 51 metres Heliox 20-22 % oxygenDepth time (min) 100Ascent to stop 2Heliox 30 m20-22% 27 m

310

24 mHeliox 21 m20-22% 18 mou Air 15 m

10152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+525+525+525+520

Total decompression 4h15

-146-

HELIOX/OXY/12 M TABLES

Depth : 54 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 4 3 3 3 3 2 2 2 2Heliox 30 m20-22%

- - - - - 3 3 5 5

27 m24 m

Heliox 21 m20-22% 18 mou Air 15 m

----3

--335

-3355

3551010

3551015

55101015

510101520

510151525

1010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1010-5--

Oxy Air

1015+5-20--

Oxy Air

1015+5-25+55-

Oxy Air

1015+5-25+525-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+525

Oxy Air

25+525+525+525+525+520

Total decompression 0h22 0h39 1h09 1h41 2h06 2h35 3h15 3h42 4h17

Depth : 57 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80Ascent to stop 4 3 3 3 3 3 2 2Heliox 33 m20-22% 30 m

--

--

--

-3

-3

-5

35

35

27 m24 m

Heliox 21 m20-22% 18 mou Air 15 m

----3

-3335

335510

3551010

55101015

510101520

510101520

1010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-20--

Oxy Air

1015+5-25+510-

Oxy Air

25+525+5-25+55-

Oxy Air

25+525+5-25+525-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+515

Total decompression 0h22 0h57 1h19 1h49 2h26 3h03 3h25 4h10

-147-

HELIOX/OXY/12 M TABLES

Depth : 60 metres Heliox 20-22 % oxygenDepth time (min) 10 20 30 40 50 60 70 80Ascent to stop 4 3 3 3 3 3 3 2Heliox 36 m20-22% 33 m

--

--

--

--

-3

-3

-5

35

30 m27 m24 m

Heliox 21 m20-22% 18 mou Air 15 m

----33

--3335

-335510

35551015

555101015

5510101520

51010152025

51010152030

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

105-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25--

Oxy Air

1015+5-25+525-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+525+525+525+55

Oxy Air

25+525+525+525+525+525

Total decompression 0h30 0h57 1h24 2h11 2h41 3h21 4h08 4h35

Depth : 36 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 21 m18-20%

- - - - - - - - 3

18 mAir 15 m

--

--

-3

-5

35

310

510

510

1015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+525-

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Total decompression 0h14 0h22 0h30 0h47 0h55 1h10 1h22 1h37 2h05

-148-

HELIOX/OXY/12 M TABLES

Depth : 36 metres Heliox 18-20 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 21 m18-20%

3 3 5 5

18 mAir 15 m

1015

1015

1020

1520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+510-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Oxy Air

25+525+525+525+515

Total decompression 2h10 2h15 2h47 2h57

Depth : 39 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 21 m18-20%

- - - - - 3 3 5 5

18 mAir 15 m

--

-3

35

35

510

510

1010

1015

1015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Total decompression 0h14 0h25 0h35 0h50 1h07 1h25 1h45 2h07 2h17

Depth : 39 metres Heliox 18-20 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 24 m18-20% 21 m

-10

310

310

310

18 mAir 15 m

1015

1520

1520

1525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+520-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 2h27 3h00 3h05 3h30

-149-

HELIOX/OXY/12 M TABLESDepth : 42 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox18-20% 24 m - - - - - - 3 3 5

21 m18 m

Air 15 m

---

--3

-35

355

3510

51010

51015

101015

101515

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+525-

Oxy Air

1015+525+510

Oxy Air

1015+525+525

Oxy Air

25+525+525+510

Oxy Air

25+525+525+520

Total decompression 0h14 0h31 0h50 1h00 1h15 1h37 2h00 2h20 2h37Depth : 42 metres Heliox 18-20 % oxygenDepth time (min) 100 110 120Ascent to stop 2 2 2Heliox18-20% 24 m 5 5 10

21 m18 m

Air 15 m

101520

101520

151525

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+520

Oxy Air

25+525+525+525+525+55

Total decompression 3h02 3h12 3h42Depth : 45 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 27 m18-20% 24 m

--

--

--

--

-3

-3

-5

35

310

21 m18 m

Air 15 m

---

-33

335

3510

5510

51010

101015

101515

101520

Oxygen12 m

9 m9 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+520--

Oxy Air

1015+525+55-

Oxy Air

1015+525+525-

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Total decompression 0h18 0h34 0h53 1h10 1h30 1h55 2h17 2h35 3h10

-150-

HELIOX/OXY/12 M TABLES

Depth : 45 metres Heliox 18-20 % oxygenDepth time (min) 100 110Ascent to stop 2 2Heliox 27 m18-20% 24 m

310

510

21 m18 m

Air 15 m

101520

152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+525

Oxy Air

25+525+525+525+525+510

Total decompression 3h25 3h57

Depth : 48 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2Heliox 27 m18-20%

- - - - - 3 3 5 5

24 m21 m18 m

Air 15 m

----

--33

-355

35510

551010

5101015

5101015

10101520

10101520

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+525--

Oxy Air

1015+525+510-

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Oxy Air

25+525+525+525+515

Total decompression 0h18 0h34 0h56 1h20 1h42 2h20 2h30 3h12 3h17

-151-

HELIOX/OXY/12 M TABLES

Depth : 48 metres Heliox 18-20 % oxygenDepth time (min) 100Ascent to stop 2Heliox 30 m18-20% 27 m

310

24 m21 m18 m

Air 15 m

10152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+525+525+525+510

Total decompression 4h05

Depth : 51 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2Heliox 30 m18-20% 27 m

--

--

--

-3

-3

-5

35

35

510

24 m21 m18 m

Air 15 m

----

-335

3355

35510

551015

5101015

10101520

10101520

10152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1010-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25+55-

Oxy Air

1015+5-25+525-

Oxy Air

25+525+5-25+510-

Oxy Air

25+525+5-25+525+55

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 0h21 0h39 0h59 1h33 2h05 2h27 3h10 3h20 4h02

-152-

HELIOX/OXY/12 M TABLES

Depth : 54 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 4 3 3 3 2 2 2 2 2Heliox 33 m18-20% 30 m

--

--

--

--

-3

-3

-5

35

35

27 m24 m21 m18 m

Air 15 m

----3

--335

335510

3551010

55101015

55101515

510101520

1010152025

1010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1015+5-5--

Oxy Air

1015+5-20--

Oxy Air

1015+5-25+510-

Oxy Air

25+525+5-25+55-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Oxy Air

25+525+525+525+525+525

Total decompression 0h22 0h49 1h19 1h46 2h25 2h40 3h22 4h05 4h25

Depth : 57 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70 80Ascent to stop 4 3 3 3 3 2 2 2Heliox 33 m18-20% 30 m

--

--

--

-3

-3

35

35

55

27 m24 m21 m18 m

Air 15 m

---33

-3335

335510

3551010

55101015

510101520

1010151525

1010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25--

Oxy Air

1015+5-25+520-

Oxy Air

25+525+5-25+510-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+520

Oxy Air

25+525+525+525+525+520

Total decompression 0h25 0h57 1h24 1h59 2h31 3h20 3h45 4h22

-153-

HELIOX/OXY/12 M TABLES

Depth : 60 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70Ascent to stop 4 3 3 3 3 2 2Heliox 36 m18-20% 33 m

--

--

--

-3

-3

35

35

30 m27 m24 m21 m18 m

Air 15 m

----33

--3355

3335510

35551015

555101015

5510101520

51010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

105-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25+525-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 0h30 0h59 1h27 2h14 2h41 3h30 4h10

Depth : 63 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60 70Ascent to stop 4 3 3 3 3 2 2

39 mHeliox 36 m18-20% 33 m

---

---

---

--3

-35

-35

355

30 m27 m24 m21 m18 m

Air 15 m

---333

-33355

3355510

355101015

5510101520

51010151525

51010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

105-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25+55-

Oxy Air

25+525+5-25+55-

Oxy Air

25+525+5-25+525+55

Oxy Air

25+525+5-25+525+520

Oxy Air

25+525+525+525+525+520

Total decompression 0h33 1h02 1h39 2h29 3h21 3h51 4h30

-154-

HELIOX/OXY/12 M TABLES

Depth : 66 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60Ascent to stop 4 3 3 3 3 3

39 mHeliox 36 m18-20% 33 m

---

---

--3

-35

-35

355

30 m27 m24 m21 m18 m

Air 15 m

---333

333355

33551010

555101015

5510101520

51010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

1010-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25+510-

Oxy Air

25+525+5-25+510-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+525+525+525+55

Total decompression 0h38 1h05 1h52 2h39 3h26 4h16

Depth : 69 metres Heliox 18-20 % oxygenDepth time (min) 10 20 30 40 50 60Ascent to stop 4 4 3 3 3 3

42 mHeliox 39 m18-20% 36 m

---

---

--3

--3

-35

335

33 m30 m27 m24 m21 m18 m

Air 15 m

----333

-333355

333551010

3555101015

55510101520

551010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

1010-5--

Oxy Air

1015+5-20--

Oxy Air

1015+5-25+520-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+520

Total decompression 0h38 1h16 2h05 2h44 3h36 4h34

-155-

HELIOX/OXY/12 M TABLES

Depth : 39 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 24 m17-18% 21 m

--

--

--

--

-3

-3

-5

-10

310

18 mAir 15 m

--

-3

35

55

510

1010

1015

1015

1015

Oxygen12 m

9 m6 m6 m

Oxy Air

335-

Oxy Air

1055-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+520-

Oxy Air

1015+525+55

Oxy Air

1015+525+520

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Total decompression 0h14 0h25 0h35 0h52 1h10 1h30 1h52 2h12 2h25

Depth : 39 metres Heliox 17-18 % oxygenDepth time (min) 100 110 120 130Ascent to stop 2 2 2 2Heliox 24 m17-18% 21 m

310

310

515

515

18 mAir 15 m

1520

1520

1525

2025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 2h45 3h05 3h17 3h42

Depth : 42 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 2 2 2 2 2 2 2 2Heliox 27 m17-18% 24 m

--

--

--

--

--

-3

-3

-5

-5

21 m18 m

Air 15 m

---

-33

335

3510

5510

51010

101015

101015

101520

Oxygen12 m

9 m6 m6 m

Oxy Air

555-

Oxy Air

10105-

Oxy Air

1015+510-

Oxy Air

1015+515-

Oxy Air

1015+525+55

Oxy Air

1015+525+515

Oxy Air

25+525+525+55

Oxy Air

25+525+525+515

Oxy Air

25+525+525+525

Total decompression 0h18 0h33 0h53 1h05 1h27 1h45 2h15 2h27 2h47

-156-

HELIOX/OXY/12 M TABLESDepth : 42 metres Heliox 17-18 % oxygenDepth time (min) 100 110 120Ascent to stop 2 2 2Heliox 27 m17-18% 24 m

-10

310

310

21 m18 m

Air 15 m

101520

152025

152030

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+5-25+525+525

Oxy Air

25+525+525+525+525+510

Total decompression 3h12 3h40 4h00Depth : 45 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 27 m17-18% 24 m

--

--

--

-3

-3

-5

35

310

510

21 m18 m

Air 15 m

---

-33

355

5510

51010

51015

101015

101520

101525

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+520--

Oxy Air

1015+525+55-

Oxy Air

1015+525+525-

Oxy Air

25+525+525+510-

Oxy Air

25+525+525+520-

Oxy Air

25+525+525+525+515

Total decompression 0h18 0h34 0h55 1h15 1h35 2h02 2h25 2h50 3h22Depth : 45 metres Heliox 17-18 % oxygenDepth time (min) 100Ascent to stop 2Heliox 27 m17-18% 24 m

510

21 m18 m

Air 15 m

152025

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

25+525+525+525+525

Total decompression 3h42

-157-

HELIOX/OXY/12 M TABLES

Depth : 48 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 2 2 2 2 2 2 2Heliox 30 m17-18% 27 m

--

--

--

--

-3

-3

-5

35

310

24 m21 m18 m

Air 15 m

---3

-335

3355

35510

551015

5101015

10101520

10101520

10152025

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

555--

Oxy Air

10105--

Oxy Air

1015+510--

Oxy Air

1015+525--

Oxy Air

1015+525+515-

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+515-

Oxy Air

25+525+525+525+510

Oxy Air

25+525+525+525+525

Total decompression 0h21 0h39 0h58 1h20 1h55 2h20 2h47 3h15 3h50

Depth : 48 metres Heliox 17-18 % oxygenDepth time (min) 100Ascent to stop 2Heliox 30 m17-18% 27 m

310

24 m21 m18 m

Air 15 m

10152030

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

25+525+525+525+525+510

Total decompression 4h10

-158-

HELIOX/OXY/12 M TABLES

Depth : 51 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60 70 80 90Ascent to stop 3 3 3 2 2 2 2 2 2

33 mHeliox 30 m17-18% 27 m

---

---

---

--3

--5

-35

-35

-510

3510

24 m21 m18 m

Air 15 m

---3

-335

35510

551010

5101015

5101520

10101520

10152025

10152030

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1010-5--

Oxy Air

1015+5-15--

Oxy Air

1015+5-25+55-

Oxy Air

1015+5-25+525-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+510

Total decompression 0h21 0h39 1h11 1h40 2h12 2h45 3h15 3h42 4h15

Depth : 54 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60 70 80Ascent to stop 3 3 3 2 2 2 2 2Heliox 33 m17-18% 30 m

--

--

--

-3

-3

35

35

35

27 m24 m21 m18 m

Air 15 m

---33

-3335

335510

3551010

55101015

510101520

510151525

1010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1015+5-5--

Oxy Air

1015+5-20--

Oxy Air

1015+5-25+510-

Oxy Air

25+525+5-25+55-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+55

Total decompression 0h24 0h52 1h19 1h48 2h25 2h55 3h35 4h05

-159-

HELIOX/OXY/12 M TABLES

Depth : 57 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60 70Ascent to stop 4 3 3 3 2 2 2

36 mHeliox 33 m17-18% 30 m

---

---

--3

--3

-35

-35

355

27 m24 m21 m18 m

Air 15 m

---33

-3355

335510

5551015

55101520

510101520

1010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

55-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25--

Oxy Air

1015+5-25+520-

Oxy Air

25+525+5-25+510-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+5-25+525+525

Total decompression 0h25 0h59 1h27 2h06 2h45 3h20 4h00

Depth : 60 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60 70Ascent to stop 4 3 3 3 3 2 2Heliox 36 m17-18% 33 m

--

--

--

-3

-3

35

35

30 m27 m24 m21 m18 m

Air 15 m

----33

-33355

35551010

355101015

5510101520

51010151525

51010152030

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

105-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25+55-

Oxy Air

1015+5-25+525-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+510

Total decompression 0h30 1h02 1h44 2h19 2h56 3h45 4h20

-160-

HELIOX/OXY/12 M TABLES

Depth : 63 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60Ascent to stop 4 3 3 3 3 2

39 mHeliox 36 m17-18% 33 m

---

---

--3

-33

-35

355

30 m27 m24 m21 m18 m

Air 15 m

---333

-33355

33551010

555101015

5510101520

51010152025

Oxygen12 m

9 m6 m6 m6 m

Oxy Air

1055--

Oxy Air

1015+510--

Oxy Air

1015+525+55-

Oxy Air

25+525+525+55-

Oxy Air

25+525+525+525+55

Oxy Air

25+525+525+525+525

Total decompression 0h33 1h02 1h47 2h34 3h21 4h05

Depth : 66 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60Ascent to stop 4 3 3 3 3 3

39 mHeliox 36 m17-18% 33 m

---

---

--3

-33

355

355

30 m27 m24 m21 m18 m

Air 15 m

---333

3335510

33551010

555101520

51010151525

51010152030

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

1010-5--

Oxy Air

1015+5-10--

Oxy Air

1015+5-25+510-

Oxy Air

25+525+5-25+510-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+510

Total decompression 0h38 1h12 1h52 2h49 3h51 4h26

-161-

HELIOX/OXY/12 M TABLES

Depth : 69 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50 60Ascent to stop 4 4 3 3 3 3

42 mHeliox 39 m17-18% 36 m

---

---

--3

-33

-35

355

33 m30 m27 m24 m21 m18 m

Air 15 m

---3333

-3335510

335551015

35510101520

551010152025

5101015152530

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

1010-5--

Oxy Air

1015+5-20--

Oxy Air

1015+5-25+520-

Oxy Air

25+525+5-25+515-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+525

Total decompression 0h41 1h23 2h12 3h02 3h56 5h01

Depth : 72 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50Ascent to stop 4 4 3 3 3

42 mHeliox 39 m17-18% 36 m

---

---

-33

-33

355

33 m30 m27 m24 m21 m18 m

Air 15 m

---3333

33335510

3355101015

55510101520

551010152025

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

1010-5--

Oxy Air

1015+5-20--

Oxy Air

1015+5-25+525-

Oxy Air

25+525+5-25+525-

Oxy Air

25+525+525+525+525+55

Total decompression 0h41 1h26 2h25 3h14 4h21

-162-

HELIOX/OXY/12 M TABLES

Depth : 75 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50Ascent to stop 4 3 3 3 3

45 m42 m

Heliox 39 m17-18% 36 m

----

---3

--33

-335

3355

33 m30 m27 m24 m21 m18 m

Air 15 m

--33335

33335510

3555101015

551010101520

5101015152030

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

1010-5--

Oxy Air

1015+5-25--

Oxy Air

25+525+5-25+55-

Oxy Air

25+525+5-25+525+510

Oxy Air

25+525+525+525+525+510

Total decompression 0h46 1h34 2h37 3h39 4h44

Depth : 78 metres Heliox 17-18 % oxygenDepth time (min) 10 20 30 40 50Ascent to stop 4 3 3 3 3

45 mHeliox 42 m17-18% 39 m

---

---

-33

333

355

36 m33 m30 m27 m24 m21 m18 m

Air 15 m

---33335

3333551010

33555101015

5551010152025

55101015152530

Oxygen12 m

9 m9 m6 m6 m6 m

Oxy Air

1010-5--

Oxy Air

1015+5-25--

Oxy Air

25+525+5-25+55-

Oxy Air

25+525+5-25+525+515

Oxy Air

25+525+525+525+525+525

Total decompression 0h47 1h41 2h40 4h02 5h06

-163-

3 - HELIOX / BELL TABLES

3.1 - Heliox / Bell Tables

Set of decompression tables for bounce dives todepth ranging from 30 to 90 m.

The time interval for a new dive having usedHeliox/Bell table, is 12 hours. No repetitive dive isauthorised during this interval regardless ofbreathing mixture.

3.2 - Diving Methods

Bell bounce dive with transfer under pressure(TUF) into saturation system.

3.3 - Decompression Procedures

• Up to the first stop decompression rate must bekept between 9 and 15 m/min,

• Ascent is made with stops every 3 m in the bellor in the chamber,

• The last minute of the stop is used todecompress to next stop depth.

3.4 - Dive Mixtures

• Bottom mix is a heliox mix with an oxygenpartial pressure (pO2) ranging from 850 hPa(0.850 bar) to 1550 hPa (1.550 bar) at workingdepth of diver,

• The first part of decompression is made withheliox bottom mix until first stop is reached,

• On reaching first stop, diver breathes on maskin the bell a heliox mix with an oxygenpercentage of 20 to 22 %,

• The chamber is pressurized with a heliox mixhaving an oxygen percentage of 20 to 22 %until the transfer depth is reached. After theTUP, decompression continues in the chamber(keeping the oxygen percentage between 20 to22 %),

• From the 12 m stop up to the surface,

decompression continues with the diverbreathing oxygen on mask withinterruptions of 5 minutes breathing oxygen onmask with interruptions of 5 minutes breathingambient bell atmosphere for 25 minutesbreathing on mask.

3.5 - Contingency Procedures

Exceeding the planned bottom time

• Use either the next bottom time or the back-upbottom time,

• Or switch to heliox/Oxy/12 m tables.

Difficult dive conditions

• Play safe and, in the table, use the timeimmediately above the one corresponding tothe time actually spent.

Oxygen supply failure

• Multiply by 2 the oxygen stop time and performit on heliox 20/80 or an heliox 50/50.

Delayed TUP

• If diver is not ready to be transferred at theexact time when oxygen stop is supposed tostart, diver can stay 10 minutes at 12 metresbreathing bottom mix or heliox 20/80 waiting tobe transferred into the chamber. This 10minutes delay will not be accounted as beingpart of the decompression duration and will notmake it necessary to modify the initialdecompression protocol,

• If for any reason, the TUP is delayed for morethan 10 minutes, the diver must wait at 12 muntil his transfer and resume hisdecompression using a new table calculated fora dive adding the extra time spent at 12 m toinitial bottom time.

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TABLE N°3

BOTTOM MIXES FOR HELIOX/BELL TABLES

DiveDepth

Oxygen percentage in the heliox bottom mix

(m) 22-24 % 20-22 % 18-20 % 16-18 % 14-16 % 12-14 % 10-12 %

303336394245485154576063666972757881848790939699

102105108111114117120

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HELIOX/BELL TABLES

Depth : 75 metres Heliox 22-24% oxygenDepth time (min)Ascent to stopDecompressionHeliox 22-24 %OxygenTotal decompression

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B - SATURATION DIVING

The following instructions are applicable in helioxsaturation diving operations with storage depths(living depths) ranging from 10 to 180 m.

• Between 10 m and 195 m for excursion dives ofstandard depth range,

• Between 10 m and 210 m for excursion dives ofmaximum depth range.

For uniformity’s safe all pressures and immersionsare expressed by their equivalent depth in metres.10 m will therefore mean either an actual depth of10 metres or a pressure of 1000 hPa (1 bar).

I - Chambers Procedures

1 - Chamber Mixtures

1.1 - Mixtures Used For Chamber Operations

Mixtures used for saturation diving must be inconformity with directives of article 6 of FrenchDécret dated 28 March 1990.

1.2 - Mixtures Used For ChamberPressurisation

For chamber pressurisation to the storage depth(living depth) and to ensure an oxygen partialpressure in conformity with above décret, heliox2/98 will be used as well as a small quantity ofanother heliox mix richer in oxygen.

2 - Chamber Pressurisation Procedure

Maximum pressurisation rate depends on thestorage depth :

• 3 m/min from surface to storage depth if finaldepth does not exceed 100 metres,

• 1 m/min from surface to storage depth is finaldepth exceed 100 metres and is inferior to 180metres.

3 - Post-Pressurisation Stabilisation

No stabilisation period is necessary after an initialor intermediate pressurisation not exceeding 180metres. As soon as they arrive at storage depth,divers can proceed immediately to perform :

• A standard excursion dive ascending ordescending,

• A maximum excursion dive ascending ordescending,

• An intermediate or final decompression.

4 - Control Of Chamber EnvironmentalParameters

4.1 - Chamber Depth

Chamber depth must be controlled at +/- 0.5metre.

4.2 - Chamber Atmosphere

The atmosphere breathed by divers must be inconformity with above décret.

5 - Chamber Decompression Procedures

5.1 - Preparing For Decompression

Chamber decompression can be started whenoxygen partial pressure reaches the prescribedvalue and when divers have completed theireventual stabilisation period after an excursiondive :

• After an excursion dive of standard depthrange, divers can immediately start anintermediate of final decompression,

• After an excursion dive of maximum depthrange, divers must spend 12 hours at storagedepth prior to starting an

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intermediate or final decompression.

5.2 - Decompression Procedure

The chamber decompression is started with anascent of one metre completed in 10 minutes. Thisascent will allow the eventual pressing of the doorbetween the chamber and the bell.

The remaining chamber decompression iscontinuous. In case of delay incurred in thedecompression, no attempt must be made to makeup for time lost by accelerating the decompression.

5.3 - Chamber Decompression With An OxygenPartial Pressure Of 600 hPa (0.6 bar)

This procedure must be used for a finaldecompression from storage depths not exceeding155 m.

The decompression procedure is :

• From storage depth to 15 m, the oxygen partialpressure of chamber must be kept between575 hPa (0.575 bar) and 600 hPa (0.600 bar).The corresponding ascent rate is 45 min/m,

• From 15 m to surface, oxygen rate must bekept between 21 and 24 %. The correspondingascent rate is 60 min/m.

This procedure must not be used for intermediatedecompression. If some divers have starteddecompression with an oxygen partial pressure of600 hPa (0.6 bar) and if operational imperativesshould cause its interruption, the chamber oxygenrate must be left to decrease with the metabolicconsumption of the divers down to the valuerecommended at storage depth.

After that, final decompression must be carried outwith an oxygen partial pressure of 500 hPa (0.5bar).

5.4 - Chamber Decompression With An OxygenPartial Pressure Of 500 hPa (0.5 bar)

This procedure must be used for a finaldecompression from storage depths exceeding155 m or for intermediate decompression.

The decompression procedure is :

• From storage depth to 15 m, the oxygen partialpressure of chamber must be kept between500 hPa (0.5 bar) and 525 hPa (0.525 bar). Thecorresponding ascent rate is 50 min/m,

• From 15 m to surface, oxygen rate must bekept between 21 and 24 %. The correspondingascent rate is 60 min/m.

5.5 - Stabilisation Period After An IntermediateDecompression

After an intermediate decompression, divers mustobserve a stabilisation period of 12 hours prior tostarting either :

• An ascending excursion dive whether standardor maximum,

• A descending maximum excursion dive.

On the other hand, divers have no delay toobserve after an intermediate decompression priorto starting :

• A descending standard excursion dive,• An intermediate pressurisation,• Another intermediate final decompression.

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II - Bell Procedures

1 - Applications

These procedures are applicable also inoperations conducted with a diver-carryingsubmersible.

Excursion dives made from a bell permit divers toascend or descend from storage depth to workingdepth. During an excursion dive, the storage depthpressure must not be decreased. Decompressionmust be interrupted when an excursion dive isdeemed necessary.

During an excursion dive, storage depth pressuremay be increased.

2 - Bell Mixtures

Bottom mix is used for :

• Bell pressurisation from storage depth tobottom depth,

• Diver’s breathing during their incursion dives.

The bottom mix must be a heliox mix whoseoxygen partial pressure must be in conformity withregulations in article 7 of above décret.

3 - Different Types Of Excursion Dives

3.1 - Ascending And Descending Excursions

There are two types of excursions

• The ascending excursions which are dives atdepths shallower than that of storage depth,

• The descending excursions which are dives atdepths deeper than that of storage depth.

In certain cases, both ascending and descendingexcursions may be combined within the same dive.

3.2 - Excursion Depths Range

Excursions are characterised by the pressuredifference existing between the storage depth andthe working depth which is called the excursiondepth range or the excursion depth amplitude. Theauthorised excursion depth rage increases thedepth but is always limited at 30 m. There are twotypes of authorised excursion depth range :

• The standard excursions allowing a moderatedepth range increase and requiring nostabilisation period after the dive,

• The maximum excursions allowing a greaterdepth range but requiring a stabilisation periodafter the dive.

In certain cases, standard and maximum excursiondives may be combined.

3.3 - Excursion Bottom Time

Bottom time for standard and maximum excursiondives are not limited.

4 - Standard Excursion Dives

4.1 - Aim

Standard excursion dives are used in routineoperations. These dives allow only moderate depthrange increase but are very flexible to carry out.

4.2 - Limits

The authorised amplitudes of standard excursiondepth range are described in table n°4.

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4.3 -Stabilisation Periods

Theoretically, standard excursions require nostabilisation period after the dive. It is possible tostart an intermediate or final decompressionimmediately after a standard excursion.

5 - Maximum Excursion Dives

5.1 - Aim

Maximum excursion dives are used in specificoperation. These dives allow a greater depth rangebut entail certain limitations.

5.2 - Limitations

The authorised maximum excursion depth rangeincreases are described in table n°4.

5.3 - Stabilisation Periods

Theoretically, a maximum excursion is followed bya stabilisation period of 12 hours. After a maximumexcursion, divers must spend 12 hours at storagedepth prior to starting an intermediate or finaldecompression.

6 - Bell Depth During Excursion Dives

The depth of the bell must be kept within the limitsof standard excursion dives.

7 - Regulations In Selecting Type Of ExcursionDive

Theoretically, several ways exist to carry out aspecific operation. In practise, will be chosen theways which the most will reduce the amplitude ofascents during the dive and the amplitude ofdecompressions during the saturation.

For a given dive, the choice will be :

• Descending excursions rather than ascendingones,

• Standard excursions rather than maximumones,

• In the course of a dive, an ascending excursionfollowed by a descending excursion, ratherthan a descending excursion followed by anascending excursion.

Work planning will be arranged so as to avoidrepeated ascents for the divers. They must notmake more than one re-ascent in a maximumexcursion during one bell dive.

When storage depths modifications are necessary,preferable select :

• A change of storage depth by an intermediatepressurisation rather than by decompression,or by planning working levels of increasingdepths rather than decreasing depths,

• A complete intermediate decompression ratherthan a shorter one followed by an ascendingexcursion.

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TABLE N°4STANDARD AND MAXIMUM HELIOX EXCURSIONS

LIFELEVEL

(m)

STANDARDDESCENDINGEXCURSION

(m)

STANDARDASCENDINGEXCURSION

(m)

MAXIMUMDESCENDINGEXCURSION

(m)

MAXIMUMASCENDINGEXCURSION

(m)10111213141516171819202122232425262728293031323334353637383940414243444546474849505152

15161718192122232425272829303132333435363738394041424344454648495051525354555657585960

99999

1011121314151516171819202021222324252627282930313233343536373839404041424344

ForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbidden

343536373839404142434546474849505152535456575859606162636465676869

ForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbiddenForbidden

20212223242526272829303031323334353637

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STANDARD AND MAXIMUM HELIOX EXCURSIONS

LIFELEVEL

(m)

STANDARDDESCENDINGEXCURSION

(m)

STANDARDASCENDINGEXCURSION

(m)

MAXIMUMDESCENDINGEXCURSION

(m)

MAXIMUMASCENDINGEXCURSION

(m)53545556575859606162636465666768697071727374757677787980818283848586878889909192939495

61626364656667697071727374757677787980818283848586878890919293949596979899100101102103104105

45464748495051525354555657585960606162636465666768697071727374757677787980808182838485

707172737475767879808182838485868789909192939495969798100101102103104105106107108109111112113114115116

38394040414243444546474849505051525354555657585960606162636465666768697070717273747576

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STANDARD AND MAXIMUM HELIOX EXCURSIONS

LIFELEVEL

(m)

STANDARDDESCENDINGEXCURSION

(m)

STANDARDASCENDINGEXCURSION

(m)

MAXIMUMDESCENDINGEXCURSION

(m)

MAXIMUMASCENDINGEXCURSION

(m)96979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138

106107108109111112113114115116117118119120121122123124125126127128129130132133134135136137138139140141142143144145146147148149150

8687888990919293949596979899100100101102103104105106107108109110111112113114115116117118119120120121122123124125126

117118119120122123124125126127128129130131133134135136137138139140141142144145146147148149150151152153155156157158159160161162163

77787980808182838485868788899090919293949596979899100100101102103104105106107108109110110111112113114115

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STANDARD AND MAXIMUM HELIOX EXCURSIONS

LIFELEVEL

(m)

STANDARDDESCENDINGEXCURSION

(m)

STANDARDASCENDINGEXCURSION

(m)

MAXIMUMDESCENDINGEXCURSION

(m)

MAXIMUMASCENDINGEXCURSION

(m)139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180

151153154155156157158159160161162163164165166167168169170171172174175176177178179180181182183184185186187188189190191192193195

127128129130131132133134135136137138139140140141142143144145146147148149150151152153154155156157158159160160161162163164165166

164166167168169170171172173174175177178179180181182183184185186188189190191192193194195196197199200201202203204205206207208210

116117118119120120121122123124125126127128129130130131132133134135136137138139140140141142143144145146147148149150150151152153

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C - POST-DECOMPRESSION PROCEDURES

1 - Physical Exertion After A Dive

After their decompression, divers must not involveinto prolonged physical activities such as jogging,stair climbing, or intense sport activities. During thetwo hours following the end of theirdecompression, no assignments must be given tothem which require significant physical efforts.

2 - Post-Dive Diving

It is only after the end of the post-dive interval thattheoretically the diver has eliminated all residualconsequences of last dive and can again dive.

Decompression tables impose a compulsory timeinterval of 12 hours between two dives. This delayis compulsory prior to a second dive on air ornitrox. The only exception are repetitive dives onair, and in this case, the method to follow isdescribed in chapter 12.

After a saturation dive, divers will have to wait 24hours prior to diving on air, nitrox or heliox.

3 - Post-Dive Surveillance Of Divers

Symptoms of decompression accidents when theyoccur, appear generally within 30 minutes afterreturn to atmospheric pressure. However, thesesymptoms can still appear 10 hours or more after.Therefore, a recompression chamber must beavailable during the 12 hours following the end ofthe decompression.

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1 - Description

Medical treatments decompression afteroperations in compressed air without submersionfall into two categories :

• Decompression conducted with tables andprocedures with submersion (Annex II) in whichthe word « dive » must be replaced by the word« operation ». The whole annex is applicable.Furthermore, and only in the case of medicalemergency, a second repetitive operation isauthorised,

• Decompression conducted after a surveillanceoperation of hyperbaric oxygen therapytreatment (long exposure at low pressuretending patients) for which specific tablesappear in table 1.

2 - Specific Mention C Tables - HyperbaricOxygen Therapy

2.1 - Tables

The chamber decompression rate is 1 m/min. Timeof ascent to first stop or of return to atmosphericpressure must not be counted in the calculation oftime spent under pressure.

In tables labelled « oxygen outlet », attendantsmust breathe oxygen on mask from 12 m until theirreturn to atmospheric pressure.

Nevertheless, for operations at 12 m with oxygenoutlet, attendants can make the 3 m stop at 12 m.They start breathing oxygen on mask for anappropriate duration of time till the end of theoperation, then are directly decompressed toatmospheric pressure still breathing oxygen onmask and not making a 3 m stop.

2.2 - Repetitive Operations Procedures

Decompression tables for Mention C activitiesallow a repetitive operation when the mention« possible » appears in the repetitive dive column.

Except in the case of medical emergency, only onerepetitive operation is authorised.

The method for selecting repetitive operationsdecompressions is based on equivalent time andis described in Annex II, Chapter 12. Multi leveloperations procedure (Annex II, Chapter 9) canalso be used.

3 - Second Repetitive Operation

In case of emergency, a third operation can beconducted. It is limited to moderate-typeoperations, i.e. corresponding to followingcharacteristics

• Pressure of initial does not exceed 3 bars,• Pressure of first repetitive operation does not

exceed 1.8 bar,• Pressure of second repetitive operation does

not exceed 1.5 bar,• For each of the three operations, actual bottom

time does not exceed the values presented intable n°2.

The method to use for a second repetitiveoperation is based on equivalent time and isdescribed in Annex II, chapter 12.

The decompression table to use is the AirStandard table or the table for hospitalpractitioners. As a safety precaution, indicated airstops at 0.6 b and 0.3 b will be performedbreathing pure oxygen on mask.

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ANNEX V

PROCEDURES FOR OPERATIONSIN COMPRESSED AIR WITHOUT

SUBMERSION (MENTION D)

Pages1 - Compression tables 375

2 - Decompression tables 375Table n°1 - Equivalence between pressures in barand hPa and submersion depths below the surfaceof the underground water-table. 378

3 - Post-decompression proceduresTable n°2 - Air standard tables/Mention D 380Table n°3 - Air/Oxy tables/Mention D 389Table n°4 - Air standard tables/Mention D397

Back-up tables 397Table n°5 - Air/Oxy tables/Mention D 398

Back-up tables 398

1 - Compression Tables

Compression must be performed in such a waythat all compressed persons may correctlyequalise their ears and not exceed 3000 hPa/min(3 bars/min).

The compression of any person that does notcorrectly equalise his ears must be immediatelystopped and eventually a slight decompressionshould be performed to eliminate the pain untilcorrect equalisation is achieved.

In case this equalisation is impossible, theconcerned person must be decompressed andmust not participate in the operation.

2 - Decompression Tables

Decompression tables for operations incompressed air without submersion indicate theprocedures to follow according to the operationconditions (pressure level, duration).

In case operation conditions are such that they canendanger, decompression safety and in order toprovide an extra safety margin, use the availablebottom time immediately above the table.

2.1 - Initial Or Repetitive Operation

Time interval after the operation is the time spenton surface by attendant between two operations. Itis measured from the time of end ofdecompression to the time a new compressionbegins.

An operation is called « initial operation » when noexposure under pressure has been made in the 12hours preceding this operation.

A repetitive operation is an operation whose timeinterval surface is under 12 hours. Such anoperation is authorised only when the pressureremains at all times under 2100 hPa (2.1 bar).

When the highest pressure exceeds 750 hPa (0.75bar) only one repetitive operation every 12 hours isallowed, and the time interval prior to a newoperation must then be longer than 12 hours.

After a repetitive operation, decompression callsfor a specific procedure.

This decompression must be performed taking asworking time the sum of working times of the firstand second operations supposed to be at thesame pressure. When the two operations are notmade at the same pressure, select the highestpressure reached during the two operations, oreventually apply the calculation method for multilevel dives (annex II, chapter 9).

2.2 - Operation Pressure

Pressures during operations are measured inpressures relative to atmospheric pressure.Decompression tables use a standard

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TABLE N°1

DEPTH(m)

PRESSURE (bar) PRESSURE (hPa)

Relative Absolute Relative Absolute

03691215182124273033363942454851545760

0.00.30.60.91.21.51.82.12.42.73.03.33.63.94.24.54.85.15.45.76.0

1.01.31.61.92.22.52.83.13.43.74.04.34.64.95.25.55.86.16.46.77.0

0300600900

12001500180021002400270030003300360039004200450048005100540057006000

100013001600190022002500280031003400370040004300460049005200550058006100640067007000

Slight variations can be applied to the tables starting at the atmospheric pressure level and can be usedwith no modification :

• At altitudes ranging between 0 and 300 metres above sea level,• And for a barometric pressure variation of 0 to 50 hPa (0.05 bar).

If local pressure does not enter within these limits, an altitude correction must be applied as describedin Annex II, chapter 10.

The unit of pressure used is the bar (1000 hPa). Table n°1 gives equivalence between pressures (inbar and hPa) and submersion depths below the surface of the underground water-table.

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atmospheric pressure on surface of 1000 hPa (1bar).

2.3 - Duration Of Operation

The duration of an operation is the time elapsedfrom the beginning of pressurisation in thechamber (or in the lock) up to the beginning ofdecompression.

The time are expressed in hours and minutes(00h00). All events relative to a given operationshould be measured by one watch only.

2.4 - Selection Of Decompression Table

Decompression tables are established for workingpressures going up to 4.8 bars in 0.15 barincrements. Above 4.8 bars the procedure to applymust be specifically authorised by the LabourMinistry.

Pressures and working times of an operationseldom correspond exactly with those of thetables. Therefore, it is recommended :

• To select table whose pressure is equal to theactual working pressure or immediately aboveit,

• To use in this table the time equal to the actualworking time or the time immediately above it.

The person operating under pressure must alwayshave on hand a back-up table in case the plannedworking time is exceeded. It is the reason why foreach pressure, the last time is given in a separatetable (tables n°4 and n°5).

2.5 - Re-Ascent To The First Stop

At the beginning of decompression, the personoperating is decompressed to the pressure of thefirst stop or the surface at a constant rate. Thisdecompression must be performed at a maximalrate of 1000 hPa/min

(1 bar/min). The value given in the tablecorresponds to 300 hPa (0.3 bar/min).

2.6 - Duration Of Decompression Stops

The duration of the stop starts when the personoperating reaches the pressure of the stop.

The durations of decompression stops areindicated in each table.

The last minute of the stop time is used todecompress to the pressure of the next stop (or toatmospheric pressure).

2.7 - Decompression With Stops BreathingOxygen

2.7.1 - Aim

Breathing pure oxygen on mask accelerates theelimination of inert gases and consequently reducedecompression time. Decompression tables withoxygen stops are well-adapted to long or/and highpressure operations.

As a rule, the deeper are oxygen stops the moreefficient is the decompression process. This is whythe stop at 300 hPa (0.3 bar) is cumulated with thestop at 600 hPa (0.6 bar) in all tables using pureoxygen breathing.

2.7.2 - Limits

The use of hyperbaric oxygen is limited for toxicityreasons. Decompression tables use pure oxygenbreathing on mask at 1200, 900 and 600 hPa (1.2,0.9, 0.6 bar). In this instance, no 300 hPa (0.3 bar)stop is made.

2.7.3 - Oxygen Breathing Method

The use of oxygen increases the risk of fire. Forthis reason, the percentage of oxygen in ahyperbaric atmosphere is limited to 25 %, and

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it is advisable to continuously check the oxygenratio in the decompression lock during oxygenbreathing on mask.

Masks used for oxygen breathing must beequipped with a dump valve to prevent an exerciseentry of oxygen in the locks.

The lock ventilation system permits to keep theoxygen ration as close as possible of 21 %.

For similar reasons during the use of pure oxygenin decompression, all grease presenting a risk offire because of high oxygen partial pressures mustbe strictly prohibited in the decompression lock.

2.7.4 - Interruptions

Decompressions using oxygen stops require,every 25 minutes, periodic interruptions of 5minutes while the person operating breathes theambient air. These 5 minutes interruptions areincluded in the stop time.

2.7.5 - Decompression Logging

Strict use of procedures is the basis of safedecompression.

A good record-keeping allows a clear control ofdecompression procedures.

Decompression report should show the followingdata :

• Date of operation,• Names of participating persons and of the

operation supervisor (his signature on thereport),

• Location of operation,• Pressure of operation,• Surface interval of participants,• Time of pressurisation (time of beginning of

decompression for the maximal time underpressure allowed for each person),

• Type of work to be performed,

• Time of beginning of decompression,• Decompression procedure used and

description of gases breathed by participants,times of arrival and departure for each stop,

• Names of surface attendants, etc.

The report should be used as a working documentand filled in during the dive.

2.7.6 - Decompression Accidents Factors

Extreme conditions and hard work are often thecause of decompression accidents.

There is evidence that poor physical condition,stress, cold, hyperthermia, fatigue accumulatedafter weeks of intensive operations make theperson operating more susceptible todecompression sickness.

All these factors should be taken into considerationwhen selecting a decompression table.

When the operation’s conditions are such that theycan endanger the decompression safety, use thenext longer bottom time available in the table toprovide the persons operating with an extra safetymargin.

3 - Post Decompression Procedures

3.1 - Post Decompression Activities

Persons coming out of a decompression shouldnot indulge in hard physical activity such asrunning, stair climbing, table tennis, callisthenics,etc. Likewise, these persons should not beassigned to physically demanding tasks for at leasttwo hours.

3.2 - Post Decompression Surveillance

The symptoms of decompression accidentsgenerally become apparent within a half hour aftersurfacing to atmospheric pressure, but

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cases have occurred as long as 10 hoursafterwards. The person should therefore, incompliance with the décret, remain within

immediate reach of a therapeutic chamber for atleast 12 hours after the end of his decompression.

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ANNEX VI

EMERGENCY RECOMPRESSION

Emergency recompression tables must beapplied :

• When an incident or accident causes theomission of part of the decompression even ifno symptom becomes apparent,

• When a symptom of decompression accidentbecomes apparent, even after a normaldecompression.

These tables must be applied in the therapeuticchamber whose availability is required by thepresent regulation and according to the decision ofthe doctor assigned as per article 38, paragraph bof décret.

Emergency table n°1 is used when occurs asignificant omission in the decompression and inthe case of painful symptoms of type I.

Emergency table n°2 is used when neurologicalsymptoms of type II become apparent and in caseof pulmonary overpressure.

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TABLE N°1

EMERGENCY RECOMPRESSION TABLEFOR TYPE I DECOMPRESSION ACCIDENTS

Pressure Duration Gas Breathed Modalities CumulatedRelative bar Victim Attendant (*) Times

1.2 120 min Oxygen Air 4 periods 2 h 001.2 to 0 30 min Oxygen Oxygen Continuous 2 h 30

(*) Period = 1 period corresponds to mask breathing on oxygen during 25 minutes then breathingambient air during 5 minutes.

Continuous = Continuous mask breathing

TABLE N°2

EMERGENCY RECOMPRESSION TABLE FOR TYPE IIDECOMPRESSION ACCIDENTS OR FOR PULMONARY OVERPRESSURE

Pressure Duration Gas Breathed Modalities CumulatedRelative bar Victim Attendant (*) Times

3 60 min Heliox 50/50** Air Continuous 1 h 003 to 2.4 30 min Heliox 50/50** Air 1 Period 1 h 30

2.4 30 min Heliox 50/50** Air 1 Period 2 h 002.4 to 1.8 30 min Heliox 50/50** Air 1 Period 2 h 30

1.8 60 min Oxygen Air 2 Periods 3 h 301.8 to 1.2 30 min Oxygen Air 1 Period 4 h 00

1.2 180 min Oxygen Oxygen 6 Periods 7 h 001.2 to 0 30 min Oxygen Oxygen Continuous 7 h 30

(*) Period = 1 period corresponds to mask breathing on suroxygenated mix or oxygen during 25minutes, then breathing ambient air during 5 minutes.

Continuous = Continuous mask breathing.

(**) Heliox 50/50 = For treatment of accidents occurring in compressed air, a mixture of 50 %nitrogen/50 % oxygen may eventually be used.

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ORDER OF 22 DECEMBER 1995RELATING TO THE SAFETY TRAINING METHODS

OF SOME MARINE EQUIPMENT COMPANIESOPERATING IN A HYPERBARIC ENVIRONMENT

Ministry of Equipment, Lodging, Transport andTourism

Order of 22 December 1995 relating to the safetytraining methods of seamen of some marineequipment companies operating in a hyperbaricenvironment

NOR : EQUH9501874A

The Minister for Equipment, Lodging, Transportand Tourism,Having regard to decree n°90-277 of 28 March1990 relating to the protection of workers operatingin a hyperbaric environment, in particular articles31 and 32 ;Having regard to the order of 28 January 1991defining the safety training methods for personnelinvolved in hyperbaric operations ;Having regard to the order of 28 March 1991defining the recommendations to company doctorsresponsible for the medical supervision of workersoperating in a hyperbaric environment ;Having regard to the order of 20 August 1991stating the conditions for derogation from the agelimit to apply for a certificate in hyperbarics ;Having regard to the order of 15 May 1992 definingthe procedures for access, time spent, departureand organisation of work in a hyperbaricenvironment, in particular article 5 ;Having regard to the opinion of the specialisedcommittee for marine vocational training of 23November 1995,

Orders :

Article 1

These provisions shall apply to seamen who holda professional seaman’s record and carry out oneof the specific subaquatic activities described inarticle 3, for which the

special conditions and measurements ofequivalent effect are fixed relating to the definitionof diving crews, diving procedures and training toguarantee safety during activities carried out in ahyperbaric environment.

Article 2

To benefit from the provisions in annex I of thisorder relating to the definition of diving crews andprocedures, seamen who hold a hyperbariccertificate, mention B, which states the specificqualifying option obtained as defined in article 3below, must also hold an individual diver’s recordin accordance with the provisions stated in article 3of the aforementioned decree of 28 March 1990,issued by the I.N.P.P. under the conditions statedin the third paragraph of article 2 - II of theaforementioned order of 28 January 1991 (1).

Article 3

There are five specific qualifying options attachedto the hyperbaric certificate, mention B :Sub-marine harvests : for the harvest of authorisedanimal and vegetable species other than coral ;Marine cultivation : for farming and farmingproduction ;Immersed farming structures : for the installationand maintenance of immersed structures formarine cultivation ;Diving from vessels : for seamen on boardcommercial, fishing and pleasure vessels ;Coral fishing : for the harvest of authorised coralspecies.

Article 4

The Sub-marine harvests and Marine culturesoptions are the subject of an examination

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defined in annex III (1).The immersed farming structures, Diving fromvessels, and Coral fishing options are the subjectof an examination defined in annex III following asupplementary training course, defined in annex II,given by an organisation approved in accordancewith the provisions of article 2, paragraph II of theaforementioned order of 28 January 1991 (1).

Article 5

The head of the department for seamen andgeneral administration is responsible for theenforcement of this order, which will be

published in the Journal Officiel of the FrenchRepublic.

Paris, 22 December 1995

For the Minister and by delegation :In absence of the Headof the department for seamen andgeneral administration :The Chief Administratorof Maritime Affairs

G. GASC

(1) The annexes mentioned in articles 2 and 4 of this order can be consulted at the Ministry ofEquipment, Lodging, Transport and Tourism (seamen and general administration department, bureau ofmaritime education [GM/2], telephone : (1) 44.49.83.31 and at the seamen’s health and safety office[GM/3], telephone : (1) 44.49.83.39 , 3, Place de Fontenoy - 75700 Paris 07SP.

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ANNEX I

Definition of Diving crews and Procedures

ANNEX II

Supplementary Training Course to Mention B

ANNEX III

Examination regulations

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ANNEX I

To the order of 22 December 1995

DEFINITION OF DIVING CREWS AND PROCEDURES

Chapter I :

• Sub-marine harvests,

• Marine cultivation,

• Immersed farming structures,

• Diving from vessels.

Chapter II :

• Coral fishing.

CHAPTER 1

SUB-MARINE HARVESTSMARINE CULTIVATION

IMMERSED FARMING STRUCTURESDIVING FROM VESSELS

1 - COMPOSITION OF CREWSOn sites involving sub-aquatic operations, theminimum composition of crews carrying out theactivities stated above is fixed as follows :

1.1 - For operations up to relative pressure of 1200hPa :On the surface, the crew can comprise one personwith a hyperbaric certificate, class I mention B, andwith the appropriate marine training in handling thesupport vessel, this person combines the duties ofhead of hyperbaric operations and rescue diver ;

In diving, it can be reduced to one person notlinked to the surface.These provisions require that personnel on thesurface and diving have appropriate equipmentallowing :• The rescue diver to be permanently linked to

the boat during his rescue operation ;• Any diver in difficulty to be recovered and

pulled on board.

1.2 - For operations at relative pressure greaterthan 1200 hPa :1.2.1 - On the surface, the crew comprises atleast :• One seaman, with proof of appropriate marine

training in handling the support vessel,carrying out the duties of head of hyperbaricoperations ;

• And one rescue diver, holder of a hyperbariccertificate in the class in which the operation istaking place.

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1.2.2 - In diving, it can be reduced to one diverpermanently linked to the surface.

2 - SPECIAL PROCEDURE (Diving from vessel)

For divers on board fishing or commercial vessels,intervening in an emergency and not on site, for adiving time which does not involve the use ofdecompression stoppages, the presence of atherapeutic chamber accessible in less than twohours is not required.

CHAPTER 2

CORAL FISHING

1 - Composition of diving crews

The minimum composition of diving crews for coralfishing is defined as follows.

1.1 - On the surface, it can be reduced to oneperson, with a hyperbaric certificate, class Imention B with the appropriate marine training inhandling the support vessel, instructed by theemployer in the special procedures for coralfishing ; this person will combine the duties of headof hyperbaric operations and rescue diver ;

1.2 - In diving, it can be limited to one person notlinked to the surface.

These provisions require that personnel on thesurface and in diving wear the appropriateequipment following :

The rescue diver to be linked permanently to theboat during his rescue operation ;The diver in difficulty to be recovered and pulled onboard.

Descent to the bottom is made along a buoy ropeguide with a buoy on the surface.

During ascent, the diver releases a recovery buoyto which he remains tied, and which the supportvessel hauls in to carry out the stoppages.

2 - OPERATION PROCEDURES2.1 - Limits of operationFor coral fishing, diving with aqualungs can becarried out up to relative pressure of 9000 hPa (9bars).Above relative pressure of 6000 hPa (6 bars),synthetic respiratory mixtures must be used inaccordance with section III of decree n°90-277 of28 March 1990.Decompression is carried out for operations :2.1.1 - Up to relative pressure of 6000 hPa, withthe Air/Oxy/6 m or Air/Oxy/12 m tables appearingin annex II to the order of 15 May 1992 ;2.1.2 - From 6000 to 9000 hPa relative pressure,with the Heliox/Turret tables appearing in annex IIIof the said order or the Tri-Mixtures tablesappearing in the appendix to this annex.

The surface decompression procedure isprohibited for any operation above 6000 hPa.

2 - COMPOSITION OF MIXTURESTwo tri-mixtures are used (see tables) :• From 60 to 70 metres, a mixture containing 18

% oxygen, 67 % nitrogen and 15 % helium,prepared by mixing 15 % helium and 85 % air,

• From 75 to 90 metres, a mixture containing 15% oxygen, 55 % nitrogen and 30 % helium,prepared by mixing 30 % helium and 70 % air.

These mixtures, which are hypoxic at atmosphericpressure, should not be breathed on the surfacefor longer than the time necessary for immersionwhich should be done without delay.

2.3 - USE OF DIVING TABLES2.3.1 - The time at the bottom begins fromimmersion. The duration of the ascent to the

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first stoppage is given in the table and is part of thedecompression table. It should be strictlyobserved.During the stoppages, the divers breathe :• the bottom mixture or air up to 12 metres,• then pure oxygen from 12 metres to the

surface.2.3.2 - The duration of the stoppage change is :• ONE MINUTE when the divers are breathing

the bottom mixture or air,• THREE MINUTES when the divers are

breathing pure oxygen.2.3.3 - The time spent in changing the mixtures isnot included in the decompression. A stoppageonly begins when the diver is actually breathingthe prescribed mixture.2.3.4 - The table shows for each dive the totalduration of decompression, including stoppagechanges.2.3.5 - For each depth, the last line of time spent atthe bottom, in italics, should not be used for aprogrammed dive. It is an emergencydecompression which can only be usedexceptionally in the event of accidentallyexceeding the time spent on the bottom or in theevent of a rapid ascent, according to the proceduredefined in section 5 below.

2.4 - SUCCESSIVE DIVESSuccessive dives are forbidden.The interval between two dives (from the momentof immersion) cannot be less than 24 hours.

2.5 - RAPID ASCENT2.5.1 - In the event of an ascent at a speed greaterthan the set speed, the diver must reimmersehimself, if he is fit and healthy, in less than threeminutes at the semi-depth where he has astoppage of five minutes. The decompression isresumed by applying the emergency table givenfor the longest time spent at the bottom at thedepth of the first dive.

2.5.2 - If the diver cannot reimmerse himself in lessthan three minutes, if he shows signs of a divingaccident, or if he does not feel in sufficient physicalcondition to return to the semi-depth, he must beconsidered to be an accident victim and treatedas such.

2.6 - INTERRUPTION OF STOPPAGES2.6.1 - Stoppages with air or bottom mixtureWhen circumstances mean that the progress ofthe air or bottom mixture stoppages has to beinterrupted, the diver must, if he is fit and healthy,reimmerse himself in less than three minutes at thedepth of the stoppage he has just left. From thisdepth he applied the decompression given in theemergency table if the time spent at the bottomhas been exceeded for the depth of the dive made.

If the diver cannot reimmerse himself in less thanthree minutes, if he shows signs of a divingaccident, or if he does not feel in sufficient physicalcondition to reimmerse himself, he must beconsidered to be an accident victim and treatedas such.

2.6.2 - Oxygen stoppagesWhen the diver has to interrupt his pure oxygenstoppages, he must, if he is fit and healthy,reimmerse himself in less than three minutes at adepth of 12 metres and recommence all of theoxygen stoppages.

If the diver cannot reimmerse himself in less thanthree minutes, if he shows signs of a divingaccident, or if he does not feel in sufficient physicalcondition to reimmerse himself, he must beconsidered to be an accident victim and treatedas such.

2.7 - THERAPEUTIC REIMMERSIONTherapeutic reimmersion is forbidden.

2.8 - EMERGENCY RECOMPRESSIONIn the event of signs of a decompression accident,apply the provisions in annex VI of the order of 15May 1992.

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APPENDIX

COMPOSITION OF TERNARY MIXTURES

FOR DIVING WITH AN AQUALUNG (OPEN CIRCUIT)

60-90 M SECTION

(8 TABLES)

The composition of the mixtures is given in percentage of volume.

[ 8 tables follow]

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APPENDIX

MIXTURES FOR DIVING WITH AN AQUALUNG (OPEN CIRCUIT)

Partial pressures breathed (in bars) at different depths

60 m 70 m 75 m 90 m

PiO2 PiN2 PiO2 PiN2 PiO2 PiN2 PiO2 PiN2

1.3 4.7 1.4 5.4

1.3 4.7 1.5 5.5

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DEPTH AND DURATION (IN MINUTES) PF STOPPAGESr Bottom Mixture Oxygen TOTAL DURATION

OF DECOMPRESSION24 m 21 m 18 m 15 m 12 m 9 m 6 m 3 m (MIN)

3 3 5 25

3 3 4 10 37

3 7 4 7 12 22 73

7 7 5 10 12 29 88

3 6 7 9 9 18 30 101

7 7 14 16 14 20 23 37 163

7 12 14 19 17 20 24 41 181

13 13 17 34 17 20 30 45 217

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DEPTH AND DURATION (IN MINUTES) PF STOPPAGESAir or Bottom Mixture Oxygen TOTAL DURATION

OF DECOMPRESSION24 m 21 m 18 m 15 m 12 m 9 m 6 m 3 m (MIN)

3 3 5 26

3 3 4 20 48

6 7 4 9 12 26 83

4 6 7 7 10 15 30 99

7 7 10 9 10 21 30 114

7 11 14 18 17 20 23 41 181

11 13 17 34 17 20 30 45 222

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DEPTH AND DURATION (IN MINUTES) PF STOPPAGESAir or Bottom Mixture Oxygen TOTAL DURATION

OF DECOMPRESSION24 m 21 m 18 m 15 m 12 m 9 m 6 m 3 m (MIN)

3 4 5 28

3 3 4 23 52

4 6 7 5 10 12 29 94

7 7 8 9 9 18 31 100

4 6 6 14 9 10 24 31 125

11 12 16 34 17 20 24 46 219

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DEPTH AND DURATION (IN MINUTES) PF STOPPAGESAir or Bottom Mixture Oxygen TOTAL DURATION

OF DECOMPRESSION24 m 21 m 18 m 15 m 12 m 9 m 6 m 3 m (MIN)

3 3 3 7 35

7 3 3 8 26 57

1 6 6 7 7 10 13 30 102

5 5 6 11 9 10 21 30 119

5 5 9 14 9 14 24 30 136

11 12 24 34 17 20 33 46 245

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DURATION (IN MINUTES) PF STOPPAGESAir or Bottom Mixture Oxygen TOTAL DURATION

OF DECOMPRESSION24 m 21 m 18 m 15 m 12 m 9 m 6 m 3 m (MIN)

3 4 5 5 8 15 61

1 3 6 7 4 9 12 25 90

4 5 6 7 8 10 16 30 109

5 5 6 14 9 10 24 30 129

5 6 11 15 9 17 24 30 145

14 28 31 36 17 26 36 71 336

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DEPTH AND DURATION (IN MINUTES) PF STOPPAGESAir or Bottom Mixture Oxygen TOTAL DURATION

OF DECOMPRESSION24 m 21 m 18 m 15 m 12 m 9 m 6 m 3 m (MIN)

5 6 11 17 9 14 24 30 150

6 13 15 17 14 19 24 35 184

12 13 21 36 17 20 29 45 255

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DEPTH AND DURATION (IN MINUTES) PF STOPPAGESr or Bottom Mixture Oxygen TOTAL DURATION

OF DECOMPRESSION24 m 21 m 18 m 15 m 12 m 9 m 6 m 3 m (MIN)

5 6 14 17 9 17 24 30 160

12 13 29 36 17 20 33 52 283

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ANNEX II

To order of 22 December 1995

SUPPLEMENTARY TRAINING COURSE TO MENTION BTERMS OF REFERENCE AND PROGRAMMES

CHAPTER I - Immersed farming structures speciality

CHAPTER II - Diving from vessels speciality

CHAPTER III - Coral fishing speciality

CHAPTER IV - Training programme by speciality

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CHAPTER ISPECIALITY : IMMERSEDFARMING STRUCTURES

1 - TERMS OF REFERENCE OF EMPLOYMENT• To train and qualify seamen in techniques of

subaquatic operations on immersed farmingsites in closed water and at sea, for installationor maintenance,

• This specialisation is given in class I, mentionB.

2 - TERMS OR REFERENCE OF TRAININGA - Theoretical knowledgeKnowledge Decree 90.277 of 28.03.1990 andorders of 28.01.1991, 28.03.1991, 15.05.1992,order of ... stating the composition of the divingcrew for marine equipment companies - Be able toknow and interpret the different legislative textsrelating to safety in a subaquatic environment andin particular the provisions of annex I of this order.Knowledge sub-marine pneumatic, hydraulic andpyrotechnic tools - Be able to describe and knowthe use of sub-marine tools used to remove sand,anchor, lift, cut, solder, in the required safetyconditions.Knowledge sub-marine tools - Be able to carry outthe current maintenance of these different piecesof equipment.Knowledge personal equipment - Be able to knowthe constituent parts, to carry out the assembly,disassembly and replacement of defective parts.Knowledge collective equipment - Be able to knowthe regulations relating to the equipment .Knowledge communications - Be able to know thedifferent types of sub-marine means ofcommunication.Knowledge navigation-positioning - Be able to seta point on a sea chart from its geographicalcoordinates.Knowledge sea charts - Be able to locatezones allocated to sub-marine farmingcultivation.

• Knowledge tides - currents - Be able to explainthe relation between current and range, tocalculate a water depth and to estimate theimportance of currents.

• Knowledge marine meteorology - Be able toknow the vocabulary and read the measuringinstruments, recognise a meteorologicalsituation and predict its development.

• Knowledge buoyage - search - Be able tostudy buoyage in an area allocated to marinecultivation and know the methods of search onthe bottom from a known point.

• Knowledge diving accidents - Be able to knowthe symptoms of different diving accidents, beable to react correctly and follow anemergency and evacuation procedure, be ableto know emergency treatment at the scene,and be able to know the emergencyprocedures.

B -Practical knowledge• Knowledge seamanship in diving - Be able to

recognise the different kinds of rope and steellines. Tie the following knots while diving :n bowline hitch,n reef knot,n sheet bend,n fisherman’s bend,n carrick bend,n round turn and two half hitches.

Coil - stopper - slack - turn - tighten.Notions of resistance of lines and ropes.• Knowledge wet and dry clothing - Be able to

know and use the different types of protectiveclothing against the cold, wet or dry type.

• Knowledge diving with an aqualung andsurface supply line - Be able to carry out andgradually become used to increasingimmersion with aqualung or surface supplyline, with work and effort. Know and preventbreathlessness during work.

• Knowledge sub-marine tools - Be able touse the different tools, and carry out lifting,

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cutting soldering, sealing, clearing...Knowledge sub-marine filming - Be able to usedifferent types of cameras, watertight units, sub-marine lighting and take photographic and videofilms.Knowledge marine cultivation site - Be able toinstall and disassemble sub-marine ropes andcages.Knowledge communications - Be able to know howto use the different methods of sub-marinecommunication.

3 - TRAINING PROGRAMMEThe training course comprises two weeks ofclasses at 35 hours per week of teaching based onthe following distribution :

Disciplines

1 - Regulations - Operation procedures2 - Technical instruction3 - Safety - Emergency procedures4 - Workshop - Practical exercises5 - Practical work - Hyperbaricoperations

TOTAL

Total Hours

8 h12 h4 h

201 h

26 h

70 h

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CHAPTER IISPECIALITY :

« DIVING FROM VESSEL »

1 - TERMS OF REFERENCE OF EMPLOYMENTTrain and qualify seamen on board fishing,commercial and pleasure vessels for subaquaticoperations linked to the current services of avessel, and for repair and safety techniques,This speciality is given in classes I and II, mentionB.

2 - TERMS OF REFERENCE OF TRAININGA - Theoretical KnowledgeKnowledge Decree 90.277 of 28.03.90, Orders of28.01.91, 28.03.91, 15.05.92, Sea Order statingthe composition of the diving crew in marineequipment companies - Be able to know andinterpret the different statutory texts relating tosafety in a hyperbaric environment and inparticular the provisions of ANNEX I of this order,Knowledge Sub-marine pneumatic, hydraulic andpyrotechnic tools - Be able to know the principlesof operation of equipment for soldering, cutting,lifting, sealing, filling, brushing,Knowledge search under hull and filling - Be ableto know the methods of searching under the hull byday and night - Be able to know the different typesof damage which may occur on quick works - Beable to know the methods of filling a breach,Knowledge construction of the hull of a vessel - Beable to define the characteristics of a vessel,Knowledge partitioning - Be able to locate thedifferent parts of a vessel - Be able to justify anddefine partitioning procedures,Knowledge propelling apparatus - Steeringapparatus - Be able to know the different types oftail shafts and propellers - Be able to know thedifferent types of rudder blades,Knowledge filters - Be able to know the

different types of filters according to theirintended use,

• Knowledge stabilisation - Bilge keels - Be ableto know the different types of stabilisation barsand bilge keels,

• Knowledge sub-marine filming - Be able toknow the different types of photo and videocameras, used in watertight units, and sub-marine lighting for filming,

• Knowledge personal and collective equipment- Be able to know the different types of divingequipment, personal and collective, such asaqualung, air line,

• Knowledge means of communication - Be ableto know the means of communication, ensuremaintenance and know the related regulations,

• Knowledge diving accidents - Be able to knowthe symptoms of diving accidents, be able toreact correctly, give immediate treatment andprovide emergency evacuation procedure - Beable to know emergency procedures.

B - Practical Knowledge• Knowledge seamanship in diving - Be able to

tie the following knots under water :• bowline hitch,• reef knot,• sheet bend,• fisherman’s bend,• carrick bend,• round turn and two half hitches,

Be able to know the different types of ropeand steel lines,

• Knowledge dry and wet clothing - Be able toknow, use and maintain different protectiveclothing against the cold, dry or wet,

• Knowledge aqualung, surface supply line -Beable to use aqualung, surface supply line indiving, with work, at increasing depths day andnight,

• Knowledge communications - Be able to knowthe different types of sub-marine means ofcommunication - Be able to know

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how to combat breathlessness and prevent it,Knowledge sub-marine tools - Be able to use thedifferent sub-marine tools in diving and carry outsoldering, cutting, sealing, filling, brushing,sectioning of rope or steel lines,

• Knowledge search - Orientation - Be able tocarry out various search methods on thebottom and under the hull,

• Knowledge hull inspection - Be able to carryout a reconnaissance by day and night, giveexact positioning and carry out sub-marinefilming.

3 - Training Programmea - DIVING FROM VESSELS CLASS I - MENTIONBThe training course comprises one week ofclasses at 35 hours teaching per week and basedon the following distribution :

a - DIVING FROM VESSELS CLASS II -MENTION BThe training course comprises one week ofclasses at 35 hours teaching per week and basedon the following distribution :

Disciplines

1 - Regulations - Operationprocedures2 - Technical instruction3 - Safety - Emergencyprocedures4 - Workshop - Practical exercises5 - Practical work - Hyperbaricoperations

TOTAL

Total Hours

4 h6 h

3 h

6 h

16 h

35 h

Disciplines

1 - Regulations - Operationprocedures2 - Technical instruction3 - Safety - Emergencyprocedures4 - Workshop - Practical exercises5 - Practical work - Hyperbaricoperations

TOTAL

Total Hours

5 h5 h

5 h

4 h

16 h

35 h

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CHAPTER IIISPECIALITY : CORAL FISHING

1 - TERMS OF REFERENCE OF EMPLOYMENTTrain and qualify fishermen in techniques of freediving necessary for harvesting coral,This specialisation is given in classes II and III,Access to class III is subject to significant priorexperience of the work in class II, in this activity,within mentions A and B.

2 - TERMS OF REFERENCE OF TRAININGA - Theoretical Knowledge

For Class IIKnowledge Decree 90.277 of 28 March 90 - Orderof 28 January 91 - Order of 28 March 91 - Order of15 May 92 - Sea order stating the composition ofdiving crew for marine equipment companies - Beable to know the general text defining the methodsof the protection of workers operating in ahyperbaric environment and in particular articles 3and 32 of the decree - Know the conditions formedical skills - Know the safety trainingprocedures - Know the methods and proceduresfor access for time spent and departure from ahyperbaric environment and in particular annex I ofthe Sea Order,Knowledge personal diving equipment, clothing,accessories, bottles, surface supply lines, headequipment - Be able to know how to use thedifferent protective clothing against the cold andthe accessories necessary for diving,Knowledge collective equipment, compressors,recompression chambers - Be able to know andknow how to use and maintain gas compressors -Be able to know how to operate a therapeuticchamber,Knowledge safety equipment - Be able to knowand know how to operate the different safety andcall procedures,

• Knowledge decompression tables from theMinistry of Labour - Be able to know how toread, interpret and implement thedecompression tables for air and oxygen,

• Knowledge emergency procedures in theevent of an accident, different types of divingaccidents - Be able to know reactions in theevent of a diving accident, know how to useemergency procedures and possiblyrecompress an accident victim in a chamber,

• Knowledge biology, ecology and utilisation ofcoral - Be able to know how to recognise thedifferent varieties of usable coral, their way oflife, growth, reproduction, know the coralenvironment, pollution, protected areas, its usein jewellery.

For Class III• Knowledge synthetic respiratory mixtures,

Nitrogen, Oxygen, Helium - Be able to knowthe physiological bases concerning each gaswith limits of use,

• Knowledge constitution of mixtures - Be able toknow the constitution of the different syntheticbinary or tri-mixtures,

• Knowledge making binary tri-mixtures - Beable to know the different methods for makingthe mixtures from the gases used, Safetyinstructions, types of superchargers,

• Knowledge analysis equipment - Be able toknow how to use the different types of gasanalyser, Calibration,

• Knowledge physio pathology of high pressures- Be able to know the signs of the highpressure nervous syndrome (S.N.H.P.),Recognise the symptoms of decompressiondisease after deep diving,

• Knowledge procedures and reactions in theevent of an accident - Be able to know how toreact in the event of an accident and knowemergency procedures to be used, Know thetreatment to be given immediately.

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B - Practical KnowledgeFor Class II

Knowledge independent diving at 60 metres - Beable to carry out and gradually become used toimmersions up to a depth of 60 metres,Knowledge monitoring of diving - Be able to applythe texts and special provisions for safety andrescue stated in ANNEX I to this order,Knowledge surface supply line - Be able to use thesurface supply line for decompression in openwater, with different types of mixtures or pureoxygen,Knowledge abnormal ascent, decompressionaccident - Be able to know how to react in theevent of an abnormal ascent and carry outemergency recompression in a chamber,Monitor therapeutic decompression in a

chamber, know the emergency andrescue procedures,

For Class III• Knowledge diving at 90 metres - Be able to

carry out and gradually become used toimmersions with respiratory mixtures up to 90metres depth,

• Knowledge making mixtures - Be able to maketernary respiratory mixtures by adding heliumto air or binary mixtures : helium - oxygen,

• Knowledge control of mixtures - Be able to usegas analyzers to control mixtures made orsupplied by an outside company,

• Knowledge emergency procedures - Be ableto application and implementation ofemergency procedures.

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3 - Training Programme b - CORAL FISHING CLASS III - MENTION Ba - CORAL FISHING CLASS II - MENTION BThe training course comprises three weeks ofclasses at 35 hours per week of teaching andbased on the following distribution :

The training course comprises three weeks ofclasses at 35 hours per week of teaching andbased on the following distribution :

Disciplines

1 - Regulations - Operationprocedures2 - Technical instruction3 - Safety - Emergencyprocedures4 - Workshop - Practical exercises5 - Practical work - Hyperbaricoperations

TOTAL

Total Hours

10 h20 h

5 h

25 h

45 h

105 h

Disciplines

1 - Regulations - Operationprocedures2 - Technical instruction3 - Safety - Emergencyprocedures4 - Workshop - Practical exercises5 - Practical work - Hyperbaricoperations

TOTAL

Total Hours

8 h12 h

10 h

22 h

53 h

105 h

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ANNEX III

To order of 22 December 1995

EXAMINATION REGULATIONS

1 - Immersed farming structures (class I, mention B)

2 - Diving from vesselsa - class I - mention Bb - class II - mention B

3 - Coral fishinga - class II - mention Bb - class III - mention B

4 - Sub-marine harvests - Sub-marine cultivation

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SPECIALITY :

IMMERSED FARMING STRUCTURES

The examination to obtain the hyperbarics certificateCLASS I - MENTION B comprises written, oral andpractical tests marked from 0 to 20. The nature,duration and coefficients of these tests are given in thetable below :

Disciplines

Written testsn Regulationsn Emergency proceduresn Safety and equipment

Total

Practical testsn Safety exercisesn Organisation

Total

Oral testsn Rescue safety

Total

General Total

Duration

20’20’

20’

2 h2 h

30’

Coefficient

11

24

224

22

10

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SPECIALITY :

DIVING FROM VESSELS

The examination to obtain the hyperbarics certificateCLASS I - MENTION B comprises written, oral andpractical tests marked from 0 to 20. The nature,duration and coefficients of these tests are given in thetable below :

SPECIALITY :

DIVING FROM VESSELS

The examination to obtain the hyperbarics certificateCLASS II - MENTION B comprises written, oral andpractical tests marked from 0 to 20. The nature, durationand coefficients of these tests are given in the tablebelow :

Disciplines

Written testsn Regulationsn Emergency proceduresn Safety and equipment

Total

Practical testsn Safety exercisesn Organisation

Total

Oral testsn Rescue safety

Total

General Total

Duration

20’20’20’

2 h2 h

30’

Coefficient

1124

224

22

10

Disciplines

Written testsn Regulationsn Emergency proceduresn Safety and equipment

Total

Practical testsn Safety exercisesn Organisation

Total

Oral testsn Rescue safety

Total

General Total

Duration

20’20’20’

2 h2 h

1 h

Coefficient

1124

224

22

10

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SPECIALITY :

CORAL FISHING

The examination to obtain the hyperbarics certificateCLASS II - MENTION B comprises written, oral andpractical tests marked from 0 to 20. The nature, durationand coefficients of these tests are given in the tablebelow :

SPECIALITY :

CORAL FISHING

The examination to obtain the hyperbarics certificateCLASS III - MENTION B comprises written, oral andpractical tests marked from 0 to 20. The nature, durationand coefficients of these tests are given in the tablebelow :

Disciplines

Written testsn Regulationsn Emergency proceduresn Safety and equipment

Total

Practical testsn Safety exercisesn Organisation

Total

Oral testsn Rescue safety

Total

General Total

Duration

20’20’20’

2 h2 h

1 h

Coefficient

1124

224

22

10

Disciplines

Written testsn Regulationsn Emergency proceduresn Safety and equipment

Total

Practical testsn Safety exercisesn Organisation

Total

Oral testsn Rescue safety

Total

General Total

Duration

20’

20’

20’

4 h2 h

1 h

Coefficient

1

1

24

224

22

10

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LE JOURNAL OFFICIELLaws, Acts & Decrees

Journal Officiel N° 75 of 29th March 2000 page 4863

General TextsMinistry of Labour and Solidarity

Decree of 24th March 2000 modifying the Decree of 28th January 1991relating to the definition of procedures for safety training of personnel

taking part in hyperbaric operations.

The Minister of Labour & Solidarity, the Minister of Agriculture & Fisheries and the Minister ofEquipment, Transportation & Lodging,

In consideration of the Order N° 92/51/CEE of 18th June 1992 relating to a second general systemof approval for the professional qualifications in complement of Order 89/48/CEE;

In consideration of Decree N° 90-277 of 28th March 1990 relating to the protection of workers operatingin a hyperbaric environment, in particular Decree’s articles 3 and 32;

In consideration of the Decree of 28th January 1991 defining the procedures for safety training ofpersonnel taking part in hyperbaric operations;

In consideration of the Recommendation given by the Council for the Prevention of Occupational Risks,

In consideration of the Recommendation given by the National Committee for Health and Safety inAgricultural Work,

are decreeing :

Article 1.– Paragraph III of Art. 2 of Decree of 28th January 1991 is abrogated and replaced by the following paragraph:

“III.- Persons who are holders of one of the training certificates listed in annex III of the present decreemay apply for exemption from all or part of the training. To this end, a request should be addressed fromthe place of residence, according to the case, to either the Regional Director of Labour & Employment,or to the Head of Regional Labour & Employment Inspection and Agricultural Social Policies, or to theRegional Director of Maritime Affairs, who will issue an attestation of equivalence to the appropriatecertificate in conformity with instructions of above paragraph I, and after endorsement from INPP to benotified within one month.

The equivalence to the Certificate of competence is assessed by examining the applicant’squalifications and his professional experience in connection with the applicant’s activities and the typeof hyperbaric work to be performed. In view of this, the applicant should constitute a file with documentssupporting the qualifications and acquired experience to justify his request.

When the assessment of the documents shows that the applicant’s professional competence isinsufficient in matters of health and safety and does not reach the level of the requested certificate, theinvolved Regional Director will inform the applicant, and he will offer him either to submit to a test liableto validate his acquired competence and experience or to follow an adaptation course in order tocomplete his skills. Disputes over this decision will be submitted to the Minister of Labour who will

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adjudicate and notify his decision within one month. In default of this notification, the dispute is deemedrejected and a contentious appeal can be implemented.

According to the level and category requested and after having chosen one of the two options, theapplicant contacts an approved Training Centre as mentioned in paragraph II of the present article towork out the selected option. If successful, an Equivalence Certificate to the appropriate Certificate isissued by the involved Regional Director.”

Article 2.- Annex III of Decree of 28th January 1991 is modified as follows :1. After the annex title and before subtitle:”For categories A” are inserted a I and II as follows:

“I. - General Dispositions:All diplomas, Certificates or Qualifications obtained by Training courses, which are issued by thecompetent Authority of a State member of the European Union, or of a State part of the EuropeanEconomic Space, are entitled to Equivalence of all or parts of training courses defined in presentDecree. This equivalence is assessed in conformity with procedure mentioned in article 2.III.II.- Specific Dispositions :”

2. In the ‘b’ concerning Categories A, the following words:“Equivalent foreign diplomas or certificates subject to additional training on French regulations, inparticular:

- Part I, Part II certificate issued by the Health and Safety Executive (HSE);- Bell Diver certificate or Air Diver certificate issued by the Norwegian Petroleum Directorate

(NPD).”are suppressed. They are replaced by the following words :

“Equivalent foreign diplomas or certificates issued by a State not mentioned in “I” of the present annex,with a complement of training on French Regulations.”

Article. 3. The Director of Labour Relations, the Director of Operations, of Social Affairs & Employment,and the Director of Maritime Affairs and Seafarers, shall be responsible, each one in his ownDirectorate, of the implementation of the present Decree which will be published in the Journal Officielof the French Republic.

Issued in Paris, 24th March 2000

The Ministry of Labour and Solidarity