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Date: Thu, 21 Mar 1996 10:36:32 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
To: Steve Hogan <Steve_Hogan@qm*.sp*.tr*.co*>
Cc: cavers@ge*.co*, George Irvine <georgeirvine@ic*.co*>,
techdiver@terra.net
Subject: Re: Oxygen Decompression (c


> That would give George and his team a PPN2 of 5.3.
> Would't this be considered DEEP AIR, something that 
> George is vehemently against? I would expect that WKPP 
> would not add NN risk to a cave dive, even for a short time. 

George understands the risks of narcosis better than most people on this
list.  He's one of the few I've encountered who also understands why
heliox (i.e., NO narcosis) is not an ideal mixture either.  If he believes
the narcosis risks from switching to air at 190 are within acceptible
limits (when weighing other potential risks as well as logistical
considerations), then I believe, for his set of circumstances, he is
right.  His strict limit of 130 feet EAD (well, O.K., more like 140 feet
when you factor the O2) during the working portion of the dive speaks for
itself. The naive person would say "lower PN2 = safer at all times". 
George is not naive. 

But again, I'll let him answer for himself (as I should have done the
first time). 

Aloha,
Rich

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