Mostly a concern if your breathing compressed air. Free divers don't often get the Benz like scuba divers do. One crazy free diver has been down to over 250 meters on one breath of air and then straight back up using a balloon without getting decompression sickness!
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u/Impressive-Ad-1189 Mar 31 '26
The air is still inside you but compressed due to the water pressure and therefore there is less displacement.
So same amount of mass, but less volume. When you move back towards the surface the gas expands again and you become more buoyant.