Dungeon

A dungeon was a type of prison, usually located beneath a castle.

In 2363, Soleta was placed in the dungeon of the Thallonian royal palace. She escaped with the assistance of Ambassador Spock. In 2373, Si Cwan and Zak Kebron were imprisoned in the dungeon. 

The Inquisitors called their dungeons, in which they tortured heretics and dissidents, "interrogation chambers".