A pretty novel use of positional voice chat which can lead to both hilarious and terrifying situations. Isolated in a random and monster filled maze of dark corridors, you no longer hear your friends. Did they get mauled or blown up, or are they being chased out of the area? The audio design used on the voice audio is pretty well done via appropriate echos and muffling, and the sense of urgency due to danger and time sensitivity makes for a thrilling co-op experience.