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---- Microsoft Mail "VMS Mail" message ---- From: HeimannJ on Mon, Feb 22, 1993 1:38 PM Subject: RE: In-water Decompression Completion To: techdiver JR writes of the omitted deco procedure called for in his cave course: >The algorithm suggested was to get the spare tank. Then, IF AND ONLY IF >no DCS symptoms were present, to get back into the water. Then descend >to: > > 12m for 1/4 of your originally-planned 3m deco time > 9m for 1/3 of your originally-planned 3m deco time > 6m for 1/2 of your originally-planned 3m deco time >and > 3m for 1.5 of your originally-planned 3m deco time This is just a metric version of the old US Navy omitted deco procedure (you probably already knew that). Also, an addition to Bill Mayne's note about Australian in-water treatment: This procedure is described in some detail in Lippman's "Deeper into Diving" (yet another reason to get this book). I understand that an important requirement for the Australian in-water treatment is a full face mask. This would protect a diver against drowning from an O2 seizure or onset of serious Type II DCS symptoms. A diver must still be tended while in the water, since even with a face mask, he might lose bouyancy control and suffer an embolism from blow-up. Moreover, the diver must be kept warm, which could be very difficult in cold water. Apparently, in the bad old days before submersible pressure gauges, wreck divers would depend on stage bottles hung off the anchor line for long hangs since they would not have enough air when their J-valve went on reserve. If they were away from the anchor line, they would surface, swim back to the ship, and go back down to do their hang. It was thought that if one stayed surfaced for less than 5 min (perhaps based on the Navy Sur-D procedure?), one would be OK. Evelyn Bartram Dudas (1st woman to dive the Doria) describes this procedure in an interview in Aquacorps #1. She also describes the severe Type II hit she got on one such dive, even though she had surfaced for less than 5 min. So much for the 5 minute theory.
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