Run while you still can2/17/2023 ![]() ![]() ![]() It's not as simple as that, though, because regulators reduce cylinder pressure in two stages, and because of breathing habits, exertion levels and so on. Regulator studies and diver experience have shown that because of the mechanics and maintenance of regulators, diver breathing habits and rates, and the inaccuracies of submersible pressure gauges, the diver will feel out of air at a tank pressure higher than ambient pressure and that this disparity increases with depth. In theory, this occurs when ambient (surrounding) pressure equals tank pressure. What usually happens is that a diver breathes his air supply down so low that the regulator can no longer provide air at the effort level required by the diver. Indeed, in nearly all scuba accidents, the victim still has air and the regulator still functions. What you sense as an out-of-air situation is usually a low-on-air situation. ![]()
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