>>81559256A shit load.
Humans aren't supposed to be at such depths, the humans that do(divers) have special training, equippment etc to survive the hellacious effects of pressure injuries.
For one your brain or your ear drums could literally fucking explode or a blood vessel in your body could just burst.
Air pockets could form under your skin or around your rib cage causing your skin to puff.
In general it could "bend" you out shape. Hence why we call it the bends.
In theory you could bend someone in a chamber over and over again as long as you table 6 them and monitor them with a DMT after. But they would probably fatigue so hard or die of a stroke or something.
You could probably pull it of 2-3 times essentially taking them through hell for at least 48hrs if you follow full protocol