flots am
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Generally true, however your first comment looked like "if youre out of air, youre an idiot" and thats just plain wrong and insultive.
You dont need a clogged dip tube or an exploded first stage to not have a useable air supply. If your LP hose burst, your SECOND stage explide or your tank o-ring burst you may be in a world of **** faster than you may realize..
You might argue that things like a bad pressure gauge should be recognized and I think for most truely experienced divers it would be fairly easilly, but for new divers - not so much..
I know it's insulting, and quite frankly was intended that way to shake people up. Divers should not treat running out of air like it's an unavoidable random occurrence. It isn't. They also shouldn't believe that any chunk of equipment will compensate for inattention because it won't. The OP was looking for an equipment solution to a training/practice problem.
With very few exceptions, running out of air is 100% preventable, and even in those situations when it's not preventable, can be safely handled by maintaining good buddy distance, awareness and skills, using nothing more exotic than what was covered in OW class, and with the most basic of equipment.
flots.