Yeh, it all comes down to pressure equalization. I don't remember what the depth record for a man diving, without a submarine like capsule, so I'm talking about wet suit/ deep diving suit or bell. A bell subjects the man to the full pressure of the water, as it works by pumping air at high enough pressure to drive the water out the open bottom.
This is where nitrogen in the blood is a problem, and why divers must decompress.
A quick search shows a scuba record at over 1000 ft
https://www.guinnessworldrecords.co...epest-scuba-dive-at-more-than-1000-feet-60537
