Woody wrote:
Yep... seat belts can kill you too, under certain circumstance; but if only
one life is ever saved by this, isn't it worth it?

NOTHING is foolproof. One cannot prepare for every possibility, we just try
to prepare for as many as practical.

You are correct, in a 'trap' situation, spare air [as I said before] is only
a slim chance device. But shouldn't people be given EVERY chance?

[Walk into a black-damp and you'll wish you had one of these for your
retreat..]

I just didn't want to get into the debate that co2 scrubbing would be more
helpful than air/O2 in a 'trap' situation...
rb

They already carry a device which will allow them an hour of air. How
many things do you think they can lug around and still do their jobs?

jak
snip