"There are two pilots, one of which is Stockton Rush, the sub's designer and the CEO, and he drives the sub with a game controller ... It has the right levers and buttons to go up, down, left, right and so on.

This thing is controlled with a game controller. Image the reason for this whole situation is a fucking xbox one plastic controller (just if that is the case).

Edit: Apparently all failsaves should have brought the sub up to the surface, even if the crew is uncouncious.