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  At 05:02 AM 10/24/95 -0700, bmk@ds*.bc*.ca* wrote:
> I saw a device on TV the other day that (at least for me) could do the job
> of a rebreather ... to collect the exhaust gases from a diver using open
> circuit SCUBA. To do this the exhaust port (and diaphragm) of the regulator
> second stage was connected to a disk shaped object and then to the surface.
> All exhaust gas was fed to the surface and none was discharged into the
> water! ...

What on earth for? An air hose or rope from the surface is nuisance enough
when needed (or forced on by silly regulations); but who wants to be burdened
with another hose to get stale diver exhaust to the surface? Once piped to
surface, to get rebreather function it would have to be pumped back down to
the diver against the depth pressure down a surface air line. Far easier to
have a conventional rebreather. A big nitrox backpack rebreather will last as
long as most divers ever would want to stay underwater at a stretch. The only
other reason that I can think of is that to many people the word `exhaust'
smells of internal combustion engines and gave them a paranoia re pollution.

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