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MS pointed out to me the 25% at 150 is too much ppo2, and he is correct. Using 130 aed and 1.4 ppo2's as max is derived by us from extensive commercial diving records where it was dicovered that the incidence of seizure below that level was markedly reduced. As a matter of practice, using benchmarks like that for starters is what we do. For longer exposures, this is reduced according to another method. The other problem is that oxygen is more narcotic than nitrogen, so elevating the one over the other makes it worse, not better. Technical diving means doing it right, and adding risk from narcosis and high ppo2 is hardly very "technical" in a 150 foot dive, if the deco savings for a 30 minute botom time is 5 minutes. Actually, by the calculations that I use, I dove that dive with 19 oxygen and 20 helium, and decompressed on the backgas, for a total of a 12 minute deco for 25 minute bottom time. Let's be honest here : doing it right is not very sexy, but I am not a sexy guy. My friend Rod Farb is the ulitmate realistic tech diver: he normally dives a MK15.5 rebreather for his filming work with Nat Geo and Discovery channel. For his upcoming act, which is diving through ice to film whales, he is using two pieces of equipment you will not find in any tech courses: a dog sled, and a Brownies Third Lung hukka rig. This is called "Doing IT Right". -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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