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I accidently sent my message before I was done typing. A lot of people here use the DCIEM tables for technical dives. These are very conservative, are designed for cold water diving (they are used by the Canadian Navy) and are considered to be among the best tested tables. Statistically they have much lower risk than either the Navy or BSAC tables. Many people feel that the Navy tables are reasonably safe if O2 is used for 10 and 20 fsw stops. Randy Bohrer, a US trimix instructor and table authority has told me that, for practical purposes, one can assume that one minute on O2 is worth two on air for these stops. As Bill Mayne points out, repetitive diving is where the Haldanian model tends to fall apart. If you want to scare yourself about the limits of the current decompression models, read Wienke's book "Basic Decompression Theory." There is a lot about hyperbaric physiology that is just not well understood. I too know someone who got Type II bent on a repetitive dive on the Aladin Pro. He was using the conservative computer diving approach I suggested, hanging below the indicated ceiling, but a leaking drysuit (DUI!), age, and fatigue pushed him beyond the limits of the model. Unfortunately, repetitive diving is a fact of life for wreck divers. Two dives per one-day charter is standard, and most divers who have paid $50-$100 and spent several hours being seasick on the way to the wreck want to get as much bottom time as possible, risk be damned. John Heimann jheimann@sc*.gt*.co*
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