Tartarus

Special Prison For Villain Criminals - Tartarus (犯罪者持殊収監施設タルタロス) is a prison far away from civilization, where Villains are being imprisoned to interrogate them under the highest security standards possible.

Description
The high-security prison appears to be located on an island, surrounded by giant walls. The only access to the prison is a bridge. The entrance is guarded by two or more guards, who will check every vehicle that wants to get into the prison.

Sensors are continuously checking the vital functions of the prisoners, reacting even to the slightest sign of unusual behavior or attempt to activate a Quirk.

History
Not much is known about the history of the prison yet.

After the Hosu Incident the villain Stain was sent to Tartarus.

After the Kamino Incident the villain All For One was sent to Tartarus. All Might later went to meet him within the prison to discuss unresolved matters between them.

Prisoners
The prisoners are criminals for whom the death penalty is not enough. They are kept underground, watched by a multitude of sensors and guards in a big clean white room. For a certain time limit, the villains may be visited. There have been at least 1,541 prisoners in Tartarus. Known prisoners include:

Trivia

 * In Greek Mythology, is a dungeon in the underworld where the worst sinners are forever kept to be tortured for their evil deeds.
 * The manga and anime incorrectly say that it was the name of the god the ruled it but this is wrong, the god's name was Hades and he ruled all three afterlifes. This mistake was corrected in the dub.