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From: "John R. Rose" <rose@CS*.SC*.ED*>
Subject: Re: Trimix Question
To: ststev@un*.co*
Date: Mon, 5 Apr 1999 20:33:05 -0400 (EDT)
Cc: gudmund@si*.co*, techdiver@aquanaut.com

> Your father, however, is probably right, since helium is easier to
> decompress from, having a much lower potential for physiological
> damage.  It is also effectively non-narcotic, and in reducing the
> density of the breathing media, reduces overall breathing effort.  For
> technical divers, cost is the primary reason we are not all using
> helioxes.
> 
> -Sean

Even if you are willing to pay for the helium to replace all nitrogen,
its not practical to do out of the bottle cascade partial-pressure mixing.
You really have to have a Haskel pump. Just another part of cost that
you have to figure in if you are going to dive heliox.

-John

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