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I have a question for the net that has been stumping me for a while. It goes like this... 1) Your decompression ceiling is decided by your supersaturation level. 2) Supersaturation is defined relative to the partial pressure of the inert gas in question (eg N2, He, whatever). So what the heck is going on when one switches to a hyperoxic mixture while on a deco stop? My dilema is this: Say I do an air dive with such a profile that I have a 20 ft deco ceiling. I go to 20 ft and hang out for a while. My tissues are loaded with N2 to the point that reducing the PN2 below the ammount that air at 20 ft produces (about 1.27 ata) is not a good idea. The supersaturation level would be too high any shallower. Now, to reduce deco time, I can switch to a Nitrox blend. Say I switch to EAN-50. This brings my PN2 to 0.80 ata, which is about the same a surface air. What makes this different, from a deco theory perspective, from a direct ascent to the surface? Or is it just that one bubbles, but 20 ft underwater is enough to keep it sub-symptomatic? Very confused. Any ideas? Jason jturner@un*.ub*.ca* Please give generously to help the .sig challenged
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