Think of it like a shock wave passing through the cabin and everything in it in time measured in milliseconds. Everything gets very hot basically instantly on the other side of that wave. Water less than gas, I’m too lazy to figure out what would be expected to exactly happen to water, but it would definitely be between getting hot enough to kill and disassociating to elemental hydrogen and oxygen gas. The question is what does a 6000 psi step function look like as it propagates through water.

Having gotten hit on the head in a low speed car accident I wouldn’t worry at all about the suffering through the actual implosion. The speed of the shock wave would be much faster than nerves conduct information.