No practical use in Scuba whatsoever.
C'mon... what other piece of scuba gear lets you run out of air twice on the same dive?
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No practical use in Scuba whatsoever.
ORRRRRRRRRRRRRRRRRRRRR!!! You could just watch your gas and never put yourself in that kind of situation. Follow the rule of 1/3's and you should never have a problem. 1/3 in 1/3 out 1/3 reserve for emergency. Plan your dive and dive your plan!
Until the o-ring on your tank valve fails, or your first stage fails, or the crappy burst disk that hasn't been changed in 15 years fails, or...
Spare air is good for snorkeling, . . . .
C'mon... what other piece of scuba gear lets you run out of air twice on the same dive?
Spare air is good for snorkeling, AL-30 is my option and is about the same amount of money with a lot of more air A LOT MORE.
Wouldn't these failures lead to a freeflow, though? You can breathe off a freeflow while doing an emergency ascent.
Where would you attach a spare air in a DIR setup assuming right hip has canister, left hip has D-ring and knife? On the backplate secured by bungee on the backplate holes?
Wouldn't these failures lead to a freeflow, though? You can breathe off a freeflow while doing an emergency ascent.
This poll and further discussion around spare air is useless. The only reason many of the experienced divers on the forum elected to contribute is to hopefully discourage newer divers from going down this route and rather focus on quality training and doing things right in the first place.
Spare Air will kill you in the long run, because that is what complacency breeds.