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Because your actual air consumption changes with depth (even when your SAC stays constant), not your gas supply.
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Because your actual air consumption changes with depth (even when your SAC stays constant), not your gas supply.
Because your actual air consumption changes with depth (even when your SAC stays constant), not your gas supply.
Heck, I went diving once with a instructor/guide on the spiegel grove, and we where exploring the inside when all of a sudden he decides its time to exit, and upon surfaceing he had only 50psi left, when I had about 1100psi....
To elaborate: air is delivered at ambient pressure, so when you take one breath at 100 feet, 4 times more comes out than the same breath taken at the surface.
You may also notice a slight increase in gas supply due to an increase in temperature, but it will be very minimal.
Pretty amusing thread. My only Spare Air incident happened in Cozumel Aug 2008 when i was insta-buddied with Ivan. About 30 minutes into the dive Ivan turned to me and gave me the out of air signal and pulled out a Spare Air and left me floating at 60 feet with a truly dumb/shocked look on my face. Ivan clearly did not understand the purpose of the Spare Air.
So now the question becomes: how did you suck your cylinder down to 30PSI at 140feet?
My ex girlfriend could give you some suggestions