Oh, I think it's definitely plausible. The pipe rupture I'm referring to that blew my friend's leg off wasn't 50k psi. I don't remember what it was, but I want to say maybe 5k to 10k psi, which is within range of pressures at the depths around the Titanic. The pipe rupture took 2 inches of bone out of his lower leg.
It's possible I'm misremembering the psi, but that's what I recall off the top of my head.
When you posted this I immediately thought about an accident that happened in the shipyard where a hydraulic line blew and messed a guy up really bad. People were talking about how they found his keys inside him.