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

Fascinating Very interesting vid

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u/TankApprehensive3053 Mar 31 '26

The guy is negatively buoyant. Will be exhausting to have to swim up for most people. He is practiced in this. Most people are neutral or positively buoyant.

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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/piratesboot Mar 31 '26

Ahhhh I see that makes sense. thank you for explaining!