An oubliette (same origin as the French oublier, meaning "to forget")
Defined as an underground dungeon that was commonly found in the castles during the medieval times. It was used to hold political and other kinds of prisoners and was built particularly narrow and dark to increase the psychological damage.
Our Oublietteis is hidden away, and has the following features;
*Solid anchor points for restraint
*Voice Controlled LED colour changing strip lighting
*Voice Controlled Music System
*Nanny Cam for overnights, which is easily removed