Cold War bunker escape! Find the radio and cipher machine to decode intercepted ROT13 messages. Discover keycards (red, blue, yellow) and their correct insertion order. Refuel the diesel generator. Insert 3 keycards in the correct color sequence at the blast door. Wear a protective suit at the suit station to cross the radiation zone. Route: Barracks -> Comms Room -> Generator Room -> Blast Door -> Exit.