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post #41 of Old 07-23-2013
Once known as Hartley18
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Re: Need answer to something I've always Wondered About

Originally Posted by hopcar View Post
I also tried this as a teenager. I couldn't inhale at much more than a foot. Tube diameter has nothing to do with it. It's just pressure differential.

"As kids snorkelling on the Great Barrier Reef, we sometimes used a large tough clear plastic bag that was held open at the mouth with a wire frame weighted at the corners and sunk a few feet to the bottom, to provide a few lungfuls more air before we needed to head back to the surface."

This works because the air in the bag is pressurized to the same pressure as the water. The danger is that if you breath from the bag and then rise to the surface with out exhaling, your lungs will burst.
True enough.. but in practice, unless you're a Darwin Award candidate, it doesn't happen. You can feel the pressure building in your lungs as you rise and you automatically exhale.

"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
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