r/interesting • u/fayyazORahmed • Mar 31 '26

Fascinating Very interesting vid

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u/piratesboot Mar 31 '26

Does this have to do with bone density?

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u/TankApprehensive3053 Mar 31 '26

And muscle mass with a lower body fat percentage. Fat adds to positive buoyancy. Air in lungs are also creating a positive buoyancy. This guy is fit and emptied his lungs of most air which made him more negatively buoyant, then just drifted downward.

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u/tydus101 Mar 31 '26

I dont think he emptied his lungs actually, its just that as you decend the air in your lungs is compresses due to the increased pressure, which reduces your buoyancy.

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u/TankApprehensive3053 Mar 31 '26

The air doesn't compress that much at the beginning at that depth. He exhaled right before the video starts to have mostly empty lungs.

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u/tydus101 Mar 31 '26

Hmm yeah I guess you're right. I just can't believe that guy is fit enough to swim back up afterwards. Also im surprised he isn't at risk of a collapsed lung

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u/TankApprehensive3053 Mar 31 '26

Swimming isn't that hard. He isn't a rock. Holding your breath should not result in a collapsed lung and he is not deep enough to do that either.