I dreamt that I was in some bunker escaping from zombies. There was a piece of wood being propped up with a plank that kept them all out. They were all shouting for brains and trying to get in. Then they sort of went away, so I checked, but they were still really there. There was a sewer cap on the floor, and didn't want to go through that, but I pulled a rope and the whole floor collapsed and sent everyone felling down a well into a cesspool.