Quote:
Originally Posted by frogman159
Lets assume you dive to 60ft and this dive lasts you ~45 minutes when your tank hits 500psi.
A spare air is 1.7cf and if you need to use it your likely stressed.
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Not that I'm advocating for the Spare Air (I'm not... I think it's ridiculous that they market them to divers), but in this particular scenario the diver still has 14.6 cubic feet of gas to get to the surface with. Out of air would be a totally different story but if you have 500 psi left in an 80 cubic foot tank, you aren't out of air yet. You can still get a lot of breathing out of an 80 cubic foot tank that's 16.7% full.
Just a nit pick, but don't go drowning with air on your back just because your backup ran out.