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    • 1    Introduction
       

    • 2    Surface Orientated Diving (Air, Nitrox or Heliox)
       

    • 3    Closed Bell Diving
       

    • 4    Conclusions
       

    • 5    References
       

    • 6    Glossary
       

    • Appendix 1 – Gas Calculations
       

    • Appendix 2 – Gas Requirements Check Sheets
       

    • Appendix 3 – Therapeutic Gas for Saturation Diving
       

    • Appendix 4 – IMCA Diving Gas Supply Incident Reporting System

    Date: Reason: Revision:
    Date:December 2023 Reason:Quality check; headers, footers & document map updated; reference and glossary sections added; no change to content Revision:Rev. 1.1
    Date:March 2021 Reason:Updated with more comprehensive advice on appropriate minimum quantities for the many sources of gas required to support a diving project across a range of industry recognised diving methods. New guidance on minimum requirements for decompression, therapeutic, BIBS, calibration, metabolic, escape, LSP, & HRF gas stocks included. Three new appendices added. Revision:Rev. 1
    Date:September 2020 Reason:Text amended in Section 2.1 - 1) to clarify the minimum gas reserve requirements for surface orientated rescue dives Revision:Rev. 0.1
    Date:May 2012 Reason:Updated and published as new IMCA document IMCA D050 Revision:Rev.
    Date:July 1983 Reason:Initial publication as AODC 014 Revision:Rev.

IMCA documents

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Our Guidance documents are categorised as follows:

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