"Lets knock out the obvious stupidity and think like well trained Sailors in damage control of "water tight compartments"

His head Implodes from the pressure makes for a really messy clean up.
Plus now you can get graphic like seeing blood peculating out of his nose ears and corners of his eyes

Make this as graphic as you like and then as he approaches death POW His brains splatter like he was hit with a 357 Magnum using hydra shock bullets"