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It is essential that Life Support Staff 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. 

- IMCA D012 Stainless Steel in Oxygen Systems
- DVIS-3 – breathing gas management
- BS EN 12021
- IMCA D050-Minimum Quantities of Gas Required Offshore
- IMCA D022-ver2 2016 DIVE SUPERVISORS MANUAL – Chapter 9
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