crush depth buddy
Someone you're going to molest if your submarine is ever on its way to crush depth. If the submarine ever sinks unrecoverable, then the crush depth buddy will be the person you find so you can sexually assault them before you die in a pressure wave incited by the implosion of the submarine. It usually is the youngest looking, cutest sailor with the nicest butt.
"Captain, we're going down!!!" "Okay boys, you know what that means...find your crush depth buddy. Now who's at the top of my list..."