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On 6 Dec 1994, Graeme Davison wrote: > I was taught that deep first still applies > > On a similar topic I was taught that when mixing Air and Nitrox dives on the > same day - the recomendation was to do the Air dive first - Any body else got a > view ?? It seems to me that it ought to be the deepest EAD dive first, not necessarily the deepest actual depth dive. They could be different, especially if the air dive is done first. Imagine an air dive to 25msw and a nitrox-36 dive to 30msw. The EAD of the latter is 22+msw, so the air dive ought to be done first, even though it's shallower. However, given that both gases can be used on both dives, I haven't sat down to figure out which sequence gives you more total bottom time. I suspect that using the n-36 at 20msw and air at 30msw would give more TOTAL bottom time (though shifted towards the shallow dive), but it would depend on which dive is done first. I'm too busy right now, but somone should run a series of test profiles, using all four combinations of depth and gas sequence (keeping all else constant), to see how to maximize underwater time (or conversly, minimize tissue loading for fixed dive times). Perhaps try with a series of SI times? I dunno....who out there is bored? ;-) Aloha, Rich deepreef@bi*.bi*.ha*.or*
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