Oubliette

The oubliette is a pit at the bottom of the wine cellar of Loam Hall MM E7·02:22:46. When the constables ask where they can keep the suspect, Mr. Gilfoyle says the old house was once a Roman fortress and does have an oubliette in the wine cellar MM E7·02:17:59 MM E7·02:18:19. Jeremy tells Sylvester Cross that he hopes he rots in the Tower of London, and Sylvester is shoved down the pit into the dark MM E7·02:22:33 MM E7·02:22:46.

The oubliette is the cell where Sylvester Cross is shoved after his arrest: a deep stone pit with chains on the wall, twelve feet below a trap door with a heavy object on top, and a little fungus growing in the musty dark MM E7·02:22:46 MM E8·00:42:12 MM E8·00:43:31. Sylvester finds no secret doors or other way out MM E8·00:43:31.

He gets out in MM_08 by jamming one of his metal thieves' tools into the fungus to short-circuit the stove, while Lars knocks the bags off the trap door, and he rushes into the kitchen from the oubliette MM E8·01:19:08 MM E8·01:19:41. Lars sees the cellar door in the corner of the kitchen with sacks of flour weighing it down MM E8·01:16:10.