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On Sun, 8 May 1994 JOHNCREA@de*.co* wrote:

> Rich,
> 
> Hydrogen and nitrogen are used as CNS depressants to ameliorate the
> effects of HPNS (in fact, they used to use good scotch whisky in
> the North Sea for the same effect on heliox bounce dives).  
> 
> HPNS seems to "excite" the CNS, and the addition of narcotic gases
> tends to depress the CNS, hopefully leaving the diver at a more or
> less "normal" state.
> 
> Hydrogen is preferred for the extremely deep dives due to the density
> considerations as compared to nitrogen.
> 
> John
> Submariner Research, Ltd.
> (johncrea@de*.co*)



Once again, my bredth of understanding of diving physiology has been
expanded a notch by one of your messages.  Thank you!


Aloha,

Rich

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