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>At 12:06 PM 12/21/99 -0500, kirvine@sa*.ne* wrote: > >>> George >>> I do not doubt that mixed gases are generally safer than air at depth. >>>Just >>> what depth is, in my humble opinion (and 23 years of diving) diver >>>dependant. >>> We dived deep air for a long time before mix was understood or available >>> here. I happen to have very good tolerance to nitrogen narcosis and have >>> done all dozen MONITOR dives on it--with excellent photographic and/or >>> archaeological results. Others are seriously incapacitated at 100 fsw. > >Pete, > >It's well known that divers can build a tolerance to narcosis, >but they are still impaired when under high PN2s. While this >may not be life-threatening when everything is going well, it >*is* life-threatening when things are going badly. err, this may be well known, but most of the literature I could find on the subjct suggests it isn't true, people get used to narcosis and think they are more tolerant, but they aren't. If tolerance does arise it takes weeks of continuous diving (ie every day) and that is difficult to do for most people. Not to mentioin the fact that the tolerisation is small. cheers mike Michael Maibaum <mike@ma*.or*> Rheumatology Unit 20 Hanover Court ICSM @ Hammersmith Hospital Uxbridge Rd Du Cane Rd London London W12 9EP W12 0NN 0208-383-2353 (W) 0208-743-3368 (H) 07803-070761 (Mob) -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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