People, just trust me, Gabe Newell: it's actually really safe! It's controlled by a Steam Deck hot wired into a version of Source that runs Half-Life 2 and Vampire The Masquerade: Bloodlines at the same time it controls the sub. Just don't pick Malkavian on the selection screen, otherwise the lights might flicker, and the sub might malfunction, leaving you stuck deep at sea.