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It is essential that Divers and their Supervisors have a good understanding of the breathing gasses used in diving.
It is helpful if the student also views the Gas Toxicity Lesson in the Dive Medicine module.
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There are numerous gasses used for breathing in diving. Normal air is a combination of Oxygen & Nitrogen (21% O2 / 79% N). There are various reasons why nitrogen is undesirable under a high partial pressure. It is for this reason that various alternative ‘inert’ gases are used as a replacement, these include Helium and Hydrogen. 
- DVIS-3 – breathing gas management
- DMAC-005 Minimum Level of O₂ in Helium Supplied Offshore
- IMCA D048. Guidance on surface supplied diving operations using nitrox
- AODC038 The Use of Inert Gases
- IMCA D043 Marking and Colour Coding of Gas Cylinders, Quads and Banks for Diving
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Bell Diving Supervisor (BDS) Exam Prep Course
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