flots am
Contributor
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as for the no air, never should happen. bad regulator, what happen to your alternate? it's not just for your buddy!
It's definitly possible to have "no air" with a completely full tank if the dip tube or tank valve or regulator first stage inlet filter clogs. This typiclaly happens with poorly maintained tanks, when the diver goes head-down.
There's still no excuse for running out even with this type of failure, though, since you always need to be close enough to your buddy to share, or have your own fully-redundant air supply.
flots.