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On Sat, 7 May 1994 JOHNCREA@de*.co* wrote:

> Rich,
> 
> I know that many (if not most) agree anymore that HPNS is a pressure
> effect, and not due to helium.  It is just that helium has so little
> narcosis (or CNS depressant effects, however you want to state this)
> that HPNS was only observed when we were able to get to these depths 
> by using helium.  At first these symptoms were attributed directly
> to the Helium, thus the original name "helium tremors".
> 
> John

I had not heard this before.  But if it's true, why do Jean-Pierre
Imbert & the gang at COMEX reduce problems of HPNS by using hydrogen?  I
can understand why trimix (i.e. He-N2-O2) reduces HPNS because the
nitrogen seems to have a counteractive effect (this falls in line
well with what Exley told me about his experiences).  Would Hydrogen have
the same anti-HPNS effect as nitrogen?

I'm a bit confused......


Aloha,

Rich

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