The Flooded Gallery
The floor slopes toward a drain you cannot see, and the sound it makes suggests considerable depth. The remains of a rope ladder hang from a hole in the ceiling, well out of reach. Chalk marks climb the wall in a column, gauging a water level that is no longer this high.
Depth 7.
You are reading the dungeon, not walking it. Rooms are only created by people, and only from inside the maze.