Oubliette

An oubliette is a dark pit, a dungeon with no doors, featured in the movie Labyrinth. The only obvious way in or out of an oubliette is through a hole in the ceiling, which is also the only source of light for any of it's occupants.

In the film, Sarah finds herself trapped in one of these after falling through the Helping Hands. Hoggle helps her out, as he has access to a door that can be attached to the oubliette. This door can either lead an individual out of the oubliette, or into a broom closet.