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Since the topic of nitrox training, etc. has been raised, has anyone given thought to dive depth ordering? The question is aimed at a very narrow topic: use of a single gas on a dive, staying within no-deco limits. I have not been able to find in the IANTD materials statements regarding how the depths of repetitive dives should be ordered when nitrox is used on one or more of the dives. At the recreational level, we teach that the deepest dive is made first, and each successive dive is to a depth less than or equal to the preceeding dive. The approach I have taken is to do the same thing with nitrox, i.e., make each depth less than the preceeding, whether using the actual depth with air, or EAD with nitrox. That sometimes means ordering the nitrox mixes such that the dives are to less and less EAD. The kicker comes in when the O2 CNS clock is added. Now there is a balancing act between N2 loading and O2 CNS clock. Another level of complexity can then be added in discussing gas/mix ordering. There was an article in a recent Underwater USA about Ken Clayton and ordering of gases - Neox/Heliox/Nitrox/air - not necessarily as listed here. The purpose was to enhance tissue gas exchange by using removal based on atomic weight. That is getting REALLY esoteric, so how about the nitrox question first? --Ralph Landry
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