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For you guys with computer implementations of Buhlmann [Bill Mayne - does your offer to send beta test copies of your version still stand?]: When I doing deep air dives on my technical nitrox course, I used EAN36 as a travel gas above 100 fsw and O2 for 20 and 10 fsw stops. I was told that on air dives O2 was really important for safety, but the main reason we were using nitrox was for practice in using the trimix stage bottle configuration and gas switch procedure. Now I know that nitrox is important as a travel gas for trimix to accelerate He offgassing on the deep stops, and in theory can reduce decompression time for air diving as well. My question is, is using EAN for deep stops on air dives (in addition to O2 at 10 and 20 fsw) likely to significantly reduce decompression time and/or increase safety, or is it not worth the trouble? As a semi-hypothetical benchmark, suppose one is diving to 170 fsw for 30 min. I don't have the full tables handy, but extrapolating from the 1986 Buhlmann tables stuck in my desk this would require air stops below 40 fsw and about an hour of deco time (wild guess). Does using EAN as well as O2 for deco significantly reduce stop time, or is most of the accelerated decompression advantage due to the O2 alone? John P.S. I do in fact plan to be making a dive like this in a couple months, but don't worry about liability - I intend to use the air tables with O2 etc. as a saftey buffer, not for accelerated deco.
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