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Ronnie Bell sez: > Lets say I am diving a cave that has 90 percent of the passage at 110 and > 10 percent at 160. I am not going to use mix for that dive! For me it's > just not that dangerous . Um, I don't get it; Air at 160 fsw is a PPO2 of 1.2 ATA. What's the problem? ( A 1.4 ATA O2 limit would limit air depth to 190 fsw.) > I seem to recall that the limit used to be 1.8, then went to 1.6 now I > hear a call for 1.4. Hmmmmmm? From memory, didn't the US Navy establish a PPO2 limit of 1.2 ATA waaayyy back when? (This doesn't get much publicity, but I'm fairly sure it is accurate.) -frank (Who keeps his PPO2 levels at or below 1.2 ATA, and likes it that way.) -- fhd@in*.ne* | [M]athematics is not the study of intangible Platonic 1 212 559 5534 | worlds, but of tangible formal systems which have arisen 1 917 992 2248 | from real human activities. 1 718 746 7061 | -- Saunders MacLane
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