The Eastern Drift
The finished stonework stops mid-course, as if the masons were called away between one block and the next, and beyond it the passage is raw rock, following a seam east into the dark. A line of soot dots marks the ceiling at arm's-length intervals, someone's count of how far they were willing to go.
Depth 4
You are reading the dungeon, not walking it. Rooms are only created by people, and only from inside the maze.