How deep can I go with VIIB Boat?

[Keelbuster]

Crush depth depends on hull integrity. Damaged hulls can't go as deep. When you get to crush depth, the boat doesn't 'crush', but rather the light's start to flicker and the helmsman says 'we're taking damage'. Hull integrity starts to drop, and then you get the glorious death screen. If the lights are flickering, quickly reduce your depth until they stop.