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Scott:

I believe you will find that most chemical O2 generators are highly water
reactive.  Also they generate a fair amount of heat when activated.  (Read up
on the Value Jet crash in Miami).  
They have been in use as fire-fighting life-support systems for years.  Most
Navies still use them on board ship.  They are referred to as OBA's, Oxygen
Breathing Apparatus.   I hated the damn things when I was in the service.
Pain-in-the butt to use, but they did work.  As a fire-fighter I still like
my good-'ol SCBA.

I digress.  One never knows where the next technical leap will come from.  I
have always been interested in Cryogenic applications for diving myself.
(Look in old Skindivers for a series of articles about 23 yrs ago).  
My .02 worth.

Later,
Randy Williams

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