Eric Sedletzky
Contributor
I can give you some reasons why air flow could abruptly cease.today’s regulators are designed to fail wide open, as in free flow. Still plenty of gas to get to the surface. Again, with proper situational awareness and ridged equipment maintenance, there is no reason to have an out of air situation. Now, if your doing something stupid like diving beyond your training or equipment configuration.....can’t help ya.
Perhaps a tank with a lot of scale and no valve tube? The diver gets inverted and some rust or scale blocks the valve. This should have never passed a VIP.
Another guy had an ACD that failed shut somehow. Actually happened to a diver here on SB, long drawn out thread.
Dumpster diver had a diaphragm blow out on his first stage at depth with video running.
A broken lever on the second stage diaphragm would also do it.
What are the chances of any of these things happening to somebody with impeccably maintained gear and high quality brands? Nearly nil.
99.99999% of OOA situations happen because the diver F’d up.
No other excuse.