Fort Nigma is the nickname given to the upgraded detention room installed by Principal General Barrage following his reinstatement as Principal. Among its features are:
- An air gun designed to silence talking students.
- A laser grid cutting off access to the vents.
- A password protected door whose code is changed regularly.
- A signal jamming device.
- Biffy Goldstein was later able to work out a system to bypass the jamming device.
In spite of Barrage's boasts that the detention room is now impregnable Lee has been able to break out on a few occasions. However, every time he has done so, he was released by a friend on the outside.