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Jason, One approach is to get off the bottom mix as soon as possible, and to keep the pO2's as high as is safe during decompression. Look in the last 2 issues of AquaCorp for the review of Dr. X, ProPlanner, MigPlan, and DPA for a comparison and review of these programs. One problem is that when you make adjustments to the inert gas fraction (or to the bottom time as done with Dr. X) the adjustment may be appropriate for a given depth, but not conservative for a different depth. Thus, you are forced to become a guinea pig in the genesis of the safe conservative factors for your diving. The vast majority of the commercial programs available have based their claims of safety or efficieny on the work done by Dr. Bulmann, and have either limited or no in water research (ie, doppler evaluation) done before they were released on the public. The interesting point is that all the programs make the assumption that Buhlmann is not conservative enough, but on the other hand assume that the research done by Dr. Buhlmann absolved them from doing any research. As far as I know, Dr. Buhlmann did not ever publish any research on trimix dives. Obviously, divers should dive conservatively, with adequate hydration and thermal protection, no matter what program is used to generate the decompression profiles. I strongly recommend that all users of these programs compare the profiles generated to some type of "standard" tables that have been intensively validated. Currently, I recommend the DCIEM air and heliox tables as standards to compare computer generated profiles to. John Submariner Research, Ltd. (johncrea@de*.co*)
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