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To: deepreef@bi*.bi*.ha*.or*
To: techdiver@opal.com
Subject: Re: "Cold Narc"
From: <JOHNCREA@de*.co*>
Date: Sun, 08 May 1994 09:56:45 -0400 (EDT)

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*)

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