Implosion of the pressure hull at that depth would take less than 100ms, killing them instantly.

Lol. The thing would have imploded near the speed of sound. They were the compressed version of pink mist and wouldn't have even perceived it coming.

That being said, if not applied catastrophically the human body is incompressible and can withstand any level of ambient pressure we've managed to put it in alive. Dives are limited by all possible breathing gasses becoming narcotic or otherwise toxic at high enough pressures, instead.