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Alright, this is going to sound like a joke, but is actually serious and true.

    One of the problems with breathing a hydrogen oxygen mixture is that
Hydrogen is of
course (think Hindenburg) extremely combustible.  This means that it will
oxidize very
easily, especially in the presence of high concentrations of O2.  I read a bit
a while ago
about the problems associated.  I think it was somewhere above 4% O2 was
dangerous in
temrs of starting an explosion.  The one tester I read about tried to get
around this by
going down to a depth (I forget what depth, and am too lazy to calculate it)
where 4% O2
was lifesustaining I think he used air as a travel mix, then went on to a 96%
Nitrogen, 4%
Oxygen mix for a while to "flush" the high concentrations of oxygen out of his
system,
then switched to the Hydrox mixture.  He did this all on some platform that was
lowered
from a ship, as he was (obviously) afraid of narcosis, and also I think the
equipment was
too heavy to reasonably dive with.  Anyways, on the way back up, his handlers
let a line
on one side slip and the platform tilted over and he slid off never to be seen
again, so
no one knows how the trial went.

    I think there have been other tests with Hydrox, but I haven't read about
any of them,
and I thought you guys might find this story amusing.

Ben

Khoo Soo Seng wrote:

> It is safe to breathe Hydrogen/Oxygen mixture?
>
> Assuming that you are able to mix Hydrox instead of Heliox, what will be
> it's  decompression schedule compare with Heliox for the same profile?
>
> You input is much appreciated.
>
> Khoo
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