Supermax prison

A super-maximum security (supermax) or administrative maximum (ADX) prison is a "control-unit" prison, or a unit within prisons, which represents the most secure levels of custody in the prison systems of certain countries. 
The objective is to provide long-term, segregated housing for inmates classified as the highest security risks in the prison system (the "worst of the worst" criminals) and those who pose an extremely serious threat to both national and global security.
Characteristics and practices.
According to the National Institute of Corrections, an agency of the United States government, "a supermax is a stand-alone unit or part of another facility and is designated for violent or disruptive inmates. It typically involves up to 23-hour-per-day, single-cell confinement for an indefinite period of time. Inmates in supermax housing have minimal contact with staff and other inmates," a definition confirmed by a majority of prison wardens.
In 2001, academics Leena Kurki and Norval Morris wrote that there was no universal, agreed upon definition for "supermax" and that prisons are classified inconsistently. They identified four general features of supermax prisons:
Prisoners are placed not as a punishment of their crimes but by their previous history when incarcerated or based on reliable evidence of an impending disruption, such as a gang leader or the leader of a radical movement. These decisions are made as administrative protection measures and the prisoners in a supermax are deemed by correctional workers as a threat to the safety and security of the institution itself.
The amount of inmate programming varies from jurisdiction to jurisdiction. Certain jurisdictions provide entertainment for their inmates in the form of television, educational and self-help programs. Others provide instructors who speak to inmates through the cell door. Some jurisdictions provide no programming to its inmates. In a supermax, prisoners are generally allowed out of their cells for only one hour a day (one-and-a-half hours in California state prisons). Exercise is done in indoor spaces or small, secure, outdoor spaces, usually alone or in a pair and always watched by the guard. Group exercise is offered only to those who are in transition programs.
Inmates receive their meals through ports in the doors of their cells.
Prisoners are under constant surveillance, usually with closed-circuit television cameras. Cell doors are usually opaque, while the cells may be windowless. Furnishings are plain, with poured concrete or metal furniture common. Cell walls, and sometimes plumbing, may be soundproofed to prevent communication between the inmates.
Supermax and Security Housing Unit (SHU) prisons are controversial. One criticism is that the living conditions in such facilities violate the United States Constitution, specifically, the Eighth Amendment's proscription against "cruel and unusual" punishments. A 2011 New York Bar association comprehensive study suggested that supermax prisons constitute "torture under international law" and "cruel and unusual punishment under the U.S. Constitution". In 2012, a federal class action suit against the Federal Bureau of Prisons and officials who run ADX Florence SHU ("Bacote v. Federal Bureau of Prisons", Civil Action 1:12-cv-01570) alleged chronic abuse, failure to properly diagnose prisoners, and neglect of prisoners who are seriously mentally ill. The suit was dismissed.
History.
Australia.
An early form of supermax-style prison unit appeared in Australia in 1975, when "Katingal" was built inside the Long Bay Correctional Centre in Sydney. Dubbed the "electronic zoo" by inmates, Katingal was a super-maximum security prison block with 40 prison cells having electronically operated doors, surveillance cameras, and no windows. It was closed down two years later over human rights concerns. Since then, some maximum-security prisons have gone to full lockdown as well, while others have been built and dedicated to the supermax standard. In September 2001, the Australian state of New South Wales opened a facility in the Goulburn Correctional Centre to the supermax standard. While its condition is an improvement over that of Katingal of the 1970s, this new facility is nonetheless designed on the same principle of sensory deprivation. It has been set up for 'AA' prisoners who have been deemed a risk to public safety and the instruments of government and civil order or are believed to be beyond rehabilitation. Corrections Victoria in the state of Victoria also operates the Acacia and Melaleuca units at Barwon Prison which serve to hold the prisoners requiring the highest security in that state including Melbourne Gangland figures such as Tony Mokbel, and Carl Williams, who was murdered in the Acacia unit in 2010.
Brazil.
In 1985, the state government of São Paulo created an annex to a psychiatric penitentiary hospital meant to house the most violent inmates of the region and established the Penitentiary of Rehabilitation Center of Taubaté, also known as Piranhão. Previously, high-risk inmates were housed at a prison on Anchieta Island; however, that closed down after a bloody massacre. At Taubaté, inmates spent 23 hours of a day in solitary confinement and spent 30 minutes a day with a small group of seven to ten inmates. Ill-treatment of inmates occurred on a daily basis, causing major psychological impairment.
Throughout the 1990s, and the early-2000s, Brazil faced major challenges with gang structures within its prisons. The gang Primeiro Comando da Capital (PCC) gained notoriety in the prison system and had new members joining within the prisons. Riots were a common occurrence and the gang culture became uncontrollable, leading authorities to pass the controversial Regime Disciplinar Diferenciado (RDD), a culture founded from disciplinary punishment.
Germany.
Stammheim Prison, in Stuttgart, Germany, opened as a supermax-style prison in 1964, with an additional wing built in 1975 to house members of the far-left militant Red Army Faction. At the time, it was considered one of the most secure prisons in the world.
United Kingdom.
Britain's Her Majesty's Prison Service in England and Wales has had a long history in controlling prisoners that are high-risk. Prisoners are categorized into four main classifications (A, B, C, D) with A being "highly dangerous" with a high risk of escaping to category D in which inmates "can be reasonably trusted in open conditions."
The British government formed the Control Review Committee in 1984 to allow for regulating long-term disruptive prisoners. The committee proposed special units (called CRC units) which were formally introduced in 1989 to control for highly-disruptive prisoners to be successfully reintegrated. Yet a series of escapes, riots, and investigations by authorities saw the units come to a close in 1998. They would soon be replaced by Close Supervision Centres (CSC), which was meant to provide relief for long-term prisons which are still used in the present day. It was reported to hold 60 of the most dangerous men in the UK in 2015.
United States.
The United States Penitentiary Alcatraz Island, opened in 1934, has been considered a prototype and early standard for a supermax prison. A push for supermax prisons began in 1983, after two correctional officers, Merle Clutts and Robert Hoffman, were stabbed to death by inmates at Federal Penitentiary in Marion, Illinois. Norman Carlson, the director of the Federal Bureau of Prisons, argued for a new type of prison to isolate uncontrollable inmates who "show absolutely no concern for human life". USP Marion became the first "supermax" prison where inmates were isolated for 23 hours in their cells. By 1999, the United States contained at least 57 supermax facilities, spread across 30–34 states.
In recent years a number of U.S. states have downgraded their supermax prisons, as has been done with Wallens Ridge State Prison, a former supermax prison in Big Stone Gap, Virginia. Other supermax prisons that have gained notoriety for their harsh conditions and attendant litigation by inmates and advocates are the former Boscobel (in Wisconsin), now named the Wisconsin Secure Program Facility, Red Onion State Prison (in western Virginia, the twin to Wallens Ridge State Prison), Tamms (in Illinois), and the Ohio State Penitentiary. Placement policies at the Ohio facility were the subject of a U.S. Supreme Court case ("Wilkinson v. Austin") in 2005 where the Court decided that there had to be some, but only very limited, due process involved in supermax placement.
There is only one supermax prison remaining in the U.S. federal prison system, ADX Florence in Florence, Colorado. It houses numerous inmates who have a history of violent behavior in other prisons, with the goal of moving them from solitary confinement (up to 23 hours a day) to a less restrictive prison within three years. 
However, it is best known for housing several inmates who have been deemed either too dangerous, too high-profile or too great a national security risk for even a maximum-security prison. They include several prisoners convicted of domestic and international terrorism, such Timothy McVeigh and Terry Nichols, who perpetrated the Oklahoma City Bombing; Richard Reid and Umar Farouk Abdulmutallab, who separately attempted to detonate explosives on a commercial airplane flight; Theodore Kaczynski ("Unabomber"), who carried out a campaign of mail bombs; and Dzhokhar Tsarnaev, convicted for the 2013 Boston Marathon bombing. Other notable inmates include Robert Hanssen, convicted of espionage for the Soviet Union and El Chapo, a Mexican drug lord convicted in 2019.
However, many states now have created supermax prisons, either as stand-alone facilities or as secure units within lower-security prisons. State supermax prisons include Pelican Bay in California and Tamms in Illinois. In 2006, USP Marion, the original model for the modern supermax prison, was downgraded to a medium-security prison. The California State Prison, Corcoran (COR) is a hybrid model, incorporating a supermax partition, housing or having housed high-security prisoners such as Charles Manson.
Cost-benefit analysis of supermax prisons.
There is no set definition of a supermax prison; however, the United States Department of Justice and the National Institute of Corrections do agree on their purpose: "these units have basically the same function: to provide long-term, segregated housing for inmates classified as the highest security risks in a state’s prison system." 
Costs of operating a supermax prison.
Building a supermax prison, or even retrofitting an existing prison, is expensive. Construction of ADX Florence cost $60 million when it opened in 1994.
Compared to a maximum security facility, supermax prisons cost about three times more on average. The 1999 average annual cost for inmates at Colorado State Penitentiary, a supermax facility, was $32,383, compared with the annual inmate cost of $18,549 at the Colorado Correctional Center, a maximum-security prison (less than twice as expensive). The increased cost is due to the technology needed to further maintain a supermax: high-security doors, fortified walls, and sophisticated electronic systems, and because more people must be hired to maintain the buildings and facilities. There are additional costs that are harder to measure. Supermax facilities have had a history of psychological and mental health issues with their inmates. 
Prisons with supermax facilities.
North America.
United States.
 Most of these facilities only contain supermax wings or sections, with other parts of the facility under lesser security measures.
South America.
Brazil.
In Brazil, the "regime disciplinar diferenciado" (differentiated disciplinary regime), known by the acronym RDD, and strongly based on the Supermax standard, was created primarily to handle inmates who are considered capable of continuing to run their crime syndicate or to order criminal actions from within the prison system, when confined in normal maximum security prisons that allow contact with other inmates. Since its inception, the following prisons were prepared for the housing of RDD inmates:
Popular media.
The movie "Escape Plan" starring Sylvester Stallone, Arnold Schwarzenegger, and Jim Caviezel is based on an ocean-based "supermax facility".
In various Marvel Comics, "The Raft" is the name of a Supermax prison located near Ryker's Island designed to hold the most dangerous heroes and villains. It subsequently is mentioned in and appears in the Marvel Cinematic Universe, albeit amended to appear as a floating fully submersible prison.