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Date: Thu, 21 Mar 1996 08:45:23 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
To: Steve Hogan <Steve_Hogan@qm*.sp*.tr*.co*>
Cc: cavers@ge*.co*, Trey Irvine <gmiiii@in*.co*>, techdiver@terra.net
Subject: Re: Oxygen Decompression (c

> All of your PP02s are about 1.6 except for 190 feet (1.41). Do you consider
the 190 
> depth a working depth and/or is this a close PPO2 to your bottom gas? Why was
1.4
> chosen versus 1.6 for 190 ft?

I suspect because it is air, and the 190-foot limit has to do with 
narcosis, not O2 levels. Sure, he could "custom blend" a nitrox to give 
him the "best of both worlds" at that depth, but that would be silly 
because he's not at that depth long enough for it to matter.  I'm sure G 
will answer much more eloquently.

Aloha,
Rich

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