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 about five kilometers from the mainland, 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. The gate that stands in front of the mainland side of the bridge is known as "The Bronze Gate".

Tartarus' 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. Though nominally a prison, the facility effectively serves as a dumping ground for individuals who threaten or have threatened public safety to a drastic extent. Regardless of sentencing status, these individuals are incarcerated and heavily monitored in Tartarus.

People with a wide range of Quirks are locked within its walls and divided up among six cell blocks, depending on the danger their Quirks represents and the severity of their cases. The more dangerous the individual, the deeper they’re kept within the prison. The deepest level of the prison is B10, located 500 meters below sea level.

Sensors are continuously monitoring the vital functions of prisoners, reacting to even the slightest sign of unusual behavior or attempt to activate a Quirk. 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. 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. Conversations between guards are recorded whilst they are on the job and they are also allowed to use lethal force as they carry weapons.

The prison has visiting rooms where visitors can speak to prisoners from the opposite side of 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 except a few villains have been sent to Tartarus:

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 where Moonfish is awaiting the death penalty.

After the Kamino Incident, the villain All For One was sent to Tartarus and 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 Tsukauchi, Kurogiri was sent to Tartarus. Once there, he shows no sign of confessing or disclosing anything about the League of Villains, although Shota Aizawa later makes progress with him as he mentions a hospital when asked where the Nomu are made.

Months later, after the essence of All For One managed to control Tomura Shigaraki's body and escaped from the battle of Jaku accompanied by a small group of Near High-End Nomu, he decides to assault Tartarus to rescue his old body.

Despite the destruction it causes, the prison's defenses are a difficult obstacle to overcome, so All For One uses his Quirks to free as many prisoners as he can to cause a riot, which allows both his true body and the controlled Tomura manage to reunite.

Prisoners
The prisoners are criminals for whom the death penalty is not enough. They are kept underground in the prison where they are 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.

Prisoners may be manually kept alive through oxygen masks, IV fluids, and feeding tubes, such as with the case of All For One. Either way, Tartarus is the dark side of Quirks society, and it is said that anyone imprisoned there will never again emerge alive.

Known prisoners included:
 * Stain (Escaped)
 * Muscular (Escaped, later captured)
 * Moonfish (Unknown)
 * All For One (Escaped)
 * Kurogiri (Unknown)
 * Lady Nagant (Escaped)
 * Overhaul (Escaped)

Guards

 * Gyges (Deceased)
 * Briareos (Deceased)
 * Seiji Shishikura's father

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 realm in bottom of the Greek underworld where the worst beings (like 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. This was changed in the English dub of the anime into Hades which is incorrect as Hades never 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 the other sections of the Greek underworld but not Tartarus. These areas became collectively known as Hades.
 * Gyges, Briareos and Cottus are all named after Greek mythology's (giants with fifty heads and one hundred arms).
 * According to an unnamed guard, the prison has been accused of human rights violations.

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