Chuck Tribolet wrote:
100 PSI isn't enough. The intermediate pressure in a typical SCUBA
system is set at 140-160 PSI.



IIRC, from ages ago, every 30 feet of water is 1 atmosphere of pressure
(15 lb. / sq. in.) If he is going down, say 6 feet, 15 lb/sq.in. should
be fine. If he tries to go deeper, he will suck air, get none, and come
up to where he can breath.

Tom
of the Swee****er Sea