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> Could the experts tell me how much this would reduce your deco > obligation by, and wether this a viable idea. I took a typical deep air profile of 180 fsw for 30min. Here are some total decompression times: (NOTE: DO NOT TRY TO EXTRAPOLATE DECOMPRESSION SCHEDULES FROM THESE VALUES!!!!) BREATHING GAS TOTAL DECO ------------------------------------- Air all the way: 2:10 Air with O2 at 20&10fsw: 0:54 Air on bottom, NNI from 130-20, O2 at 20&10: 0:45 Air on bottom, NNI from 130-70, 50/50 from 70-20, O2 at 20&10: 0:40 Constant PO2 at 1.4 ATA: 0:37 -------------------------------------- As you can see, the biggest advantage is O2 at the shallowest decompression stops. After that, trying to keep a constant PO2 has diminishing returns. I think you're better-off sticking with open circuit all the way, with a gas switch to O2 at 20fsw to more-than cut the deco time in half. Switching to NNI at 130fsw would shave another 10 minutes off. After that, I think the risks and complexities associated with trying to blend constant PO2 in Open Circuit are not worth the benefits of a few minutes decompression time savings. Aloha, Rich deepreef@bi*.bi*.ha*.or*
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