The water is 2 feet deep. The ledges and central dais are 5 feet high (3 feet higher than the water's surface), and the chamber's ceiling is 16 feet high (11 feet above the dais and ledges). The chains dangling from the ceiling are 8 feet long.
Half embedded in the east wall is a wooden wheel. The wheel, raises or lowers the nearby portcullis.
The hole in the west wall leads to a naturally formed alcove. There is a half-submerged pile of refuse that fills it.