Titanic submersible es morte

I read that an implosion happens in 1 millisecond, while the brain only processes important events at 25 milliseconds.

It makes me wonder if they had any signs beforehand that the hull was not stable.
I saw something else stating even if there was a crack, the pressure of the water shooting through would have been enough to slice through anyone in the path. Eek
(I've not vetted this for accuracy)