There is a curly arrow pointing down, next to some rotting stairs.
You descend them quicker than is safe, each turn revealing more and more doors. Each door is false.
After about four flights, you reach a dead end. Junk lies around you, includin g a grimy bathtub.
The walls feel like they are closing in on you, and you can feel the press of he four flights of raw earth above you.
You hear a single word, clear as day: "Leave."