Some day, somebody's going to make a cosy or wholesome submarine game, in which the submarine does not sprout leaks, does not run out of O2, and is never once invaded by any octopod-raddled zombies. That day is not today. Today there is only icy darkness and suffocation. Say "hello" and probably also "AIEEEEBLubLBBLBLBL" to Darkwater, a new co-op horror extraction game in which you brave the frigid oceans of an alien moon.
