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[–] Rutcrex 0 points 2 points (+2|-0) ago 

just wanted to write the same. what could go wrong? you could tear your lungs really, really easily. I also don’t believe, the 15 minutes under water part. My guess is maximum 1 minute of breathing air.

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[–] Nobodyishome 0 points 1 point (+1|-0) ago 

What if you only go down like 15' can it affect you that much? I am honestly curious, not trying to be an ass/not going to try it.

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[–] KeinPolizist 0 points 2 points (+2|-0) ago  (edited ago)

Yes, the first 33' feet underwater are the most dangerous when breathing compressed air, as far as expansion goes. At the surface you are under one atmosphere of pressure (which if I remember correctly is 14.7 PSI). For every 33' you descend, you are adding another atmosphere of pressure. This pressure compresses the air you are breathing. At 33', a breath of air will take up 50% the volume it would at the surface, meaning if you were to take a breath at that depth and hold it and swim to the surface the air in your lungs would double in size, and burst your lungs.

At 15' the air is compressed to 75% of what it would be at the surface, meaning when it expands the air will take up 1.5 times the volume it did at the original depth. That's still more than enough to cause major injury.

The farther down you go the gas becomes more compressed and changing elevations has a less dramatic effect on the gases volume. The closer you are to the surface, the more pronounced the effect is, and that's when its most dangerous.

This is why one of the first things you learn in scuba is to never hold your breath.

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[–] 1190605? 0 points 1 point (+1|-0) ago  (edited ago)

Yup, and you can get decompression illness as well if you repeatedly dive/surface and breath compressed air. Either do scuba OR free diving. Not some crazy in between shit.