Tartarus

Special Prison For Villain Criminals - Tartarus (犯罪者持殊収監施設タルタロス) is a prison extremely distanced from civilization, where extremely dangerous Villains are imprisoned and interrogated 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 long bridge connected to a city with the entrance guarded by two or more guards that check every vehicle going in.

Sensors are continuously monitoring the vital functions of prisoners, reacting to even the slightest sign of unusual behavior, or attempt to activate a Quirk. Tartarus guards also monitor prisoners in a room with several screens displaying the inside of cells, where they are alerted to movement and speaking from prisoners. Guards are also allowed to use lethal force as they carry weapons.

Tartarus's interior is heavily armored with blast doors lining narrow, steel-plated hallways. Prisoners incarcerated inside Tartarus are heavily restrained, sitting down restrained on a large, high-tech chair with a full-body straitjacket. Prisoners may be manually kept alive through oxygen masks, IV fluids, and feeding tubes, such as All For One. The aforementioned sensors are also connected to four ceiling-mounted, automated machineguns that will fire on the prisoner if they suddenly move or have thoughts of activating their Quirk.

The prison has visiting rooms where visitors can speak to prisoners separated by a glass window. These rooms are set up so the prison guards can observe and monitor conversations between prisoners and visitors. These rooms are equipped with a microphone to talk to a visitor, and computers that can detect and display a prisoner's brainwaves, which informs guards of their state of mind during a conversation with a visitor.

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 Vanguard Action Squad Invasion, the villains Muscular and Moonfish were sent to the prison. Moonfish is awaiting the death penalty.

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 the two.

After the Shie Hassaikai Raid, the villain Overhaul was sent to Tartarus.

After being captured by Gran Torino and the detective Naomasa, Kurogiri was sent to Tartarus. Once there he shows no sign of confessing or disclosing anything about the League of Villains. Although Aizawa later makes progress with him, as he mentions a hospital when asked where the Nomu are made.

Prisoners
The prisoners are criminals for whom the death penalty is not enough. They are kept underground in the prison, watched by a multitude of sensors and guards. Outsiders can visit prisoners, although their conversations are monitored and restricted, with visitors not being able to tell prisoners anything about the outside world and having a time limit on their conversation. Pro Heroes and police are also able to talk to Tartarus prisoners to conduct investigations.

Known prisoners include:

Trivia

 * Seiji Shishikura's father is employed at Tartarus. Furthermore, the main reason Seiji ended up attending Shiketsu High School is because the school provides the students with hats that are very similar to those Tartarus employees like his father wear.
 * In Greek Mythology, is a dungeon in the underworld where the worst sinners (including the Titans) are forever kept to be tortured for their evil deeds.
 * The manga and anime say that this was the name of the god who ruled it, however, this is mistaken, as his name was Hades. This mistake was corrected in the English dub of the anime.
 * However, while Hades ruled over Tartarus, the realm was named after its original master, a primordial Deity who predated both the titans and the Olympians (Greek gods; including Hades). Hades took control of it later on, along with the other sections of the Greek underworld. These areas became collectively known as Hades (which in later translations into Latin and English, likewise became Hell).

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Tartarus