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>Dan, > >How did George choose his deco schedule for the 2nd 'retrieval' dive -- >(counted both as one long dive, calculated on-the-fly, or someone topside >provided support)? Bottom and Deco Mix (besides O2)? > >Your and WKPP's efforts to clean the 'techdive training' industry's house is >sobering to and appreciated by many on and off this list -- thank you for >the heads up. > >John Hoffman >Taipei George has been working with Dr. Bill Hamilton so long now, on special tables for WKPP use, that he runs this stuff in his head. As to how he actually computes it, that;s a question best answered by either George or Bill Mee. Regards, Dan >> -----Original Message----- >> From: Dan Volker [mailto:dlv@ga*.ne*] >> Sent: Tuesday, May 19, 1998 07:08 >> >> After George Irvine and Robert Carmichael located Jane on >> their first 20 >> minute bottom time dive, but needed to return to the >> surface for more gear >> to lift her --she was heavier than anticipated...., George >> went back down on >> the second dive and used 400 psi on the actual recovery >> dive, I used about >> 950 psi( but from just a single stage bottle, as I was not on >> doubles---but >> George had a scooter, and I had to swim fast enough to keep >> up with him .. >> and MUCH FASTER than Derrick could ever swim, even if his >> life depended on >> it) So while I used about one third of the gas Derrick had >> left, I used >> this much swimming at close to full pace for depth. He would >> have only had >> to drop to the bottom, inflate her drysuit, and or/his BC, >> and then head >> up, saving Jane's life. He would have had no real exertion, >> and should have >> used far less than I did. He could NOT have perceived risk to himself, >> provided he was actually a trained technical diver. We could >> duplicate this >> with dozens of technical divers, and each time, the diver >> would come up with >> no where near the 1500 psi use that Derrick had available to him. >> >> I suspect you will agree this is an issue of poor training on >> Derrick's >> part---or cowardice--one or the other. Tom, this was a >> "bounce" dive that >> he was faced with. . Again.... Derrick would only have had to >> go straight >> down--unlike George and I, as we had to descend up current, >> drift in , and >> look for her. Derrick would Not have needed anywhere near as >> much search >> time as we did. He had 1500 psi in his back gas---low pressure >> doubles---that's a huge reserve for the mission. >> >> Is this another case of decompression paranoia? >> >> Dan Volker > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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