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On Fri, 13 Oct 1995, joan coval wrote:

> 	However, I do not agree with the partial pressure
> exposure limits as presented in the NOAA Dive Manual.
> There is  evidence to specifying  lower exposure limits
> because of high CNS 02 toxicity probability at pp02 of 1.6
> ata as well as being exposed to this oxygen partial
> pressure near the 45 minute limit as specified in the
> NOAA manual.  This table is table 15-1 on page 15-3 of
> the October 1991 NOAA Diving Manual.

I'm not sure anyone has ever demonstrated "high CNS O2 toxicity
probability at a ppO2 of 1.6ata".  In fact, I'm not even sure anyone has
ever demonstrated any statistical differences anywhere within the 1.4-1.8
ata range. If the USN knows something, I don't know where it's been
published, other than their manual, which neglects to provide specifics. I
highly recommend that people maintain their PO2 at 1.4 ata or less because
it's a grey area, and there is no reliable warning symptoms of convulsion,
and the consequences of convulsion are likely to be very grave. 

Again, I'm not trying to be combative....

Aloha,
Rich

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