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In a previous message, Steve_Hogan@qm*.sp*.tr*.co* wrote:

>It occurs to me that unless the person using this device is trained
>in the oxygen limits (CNS O2 toxicity) that it would be REAL
>EASY to *forget* to hard floor of this
>device especially for those that this device is intended for,
>uncertified individuals
>that want to explore SCUBA without the time and effort for SCUBA
>certification (those
>most likely to NOT HAVE such training).

As I recall, the device in question was designed to breathe very hard
if the user got below the designed operating floor.  Granted, this is
no guarantee that a determined user couldn't find a way to hurt himself
with the rebreather, but it sounded like the manufacturer took CNS O2
tox into account.  Because the flexible tubing expanded and contracted
with the user's breathing, I noticed that everyone seemed to breathe
in quick, shallow breaths, although it's not possible to know whether
that was because of some inherent design flaw or simply nervous divers.

Ten minutes at fifteen feet definitely puts this thing into the toy
category but for its price... 800 USD.  That's one of my biggest
problems with the show "Beyond 2000"; more often than not, they trot
out gadgets that are impossibly impractical, gush over them for five
or ten minutes, and then say "Gee whiz" at the end.  Gag.

Tim

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