In the worst case - Water doesn’t compress. Engine is a pump. Water gets sucked into the intake, into the engine, and the connecting rods bend. Catastrophic failure. The air intake usually is either high (level with the hood) or has a relief at that height to avoid this, but you obviously can’t fix this level of stupid.

It might be electrical, because it’s quite deep for those cars, but I’m not sure that’s the case.