The man convicted and sentenced to death for planting bombs at the Boston Marathon in 2013 has been moved from Massachusetts to Supermax, the nation's most secure federal prison in Colorado.
Dzhokhar Tsarnaev was taken this week to the US Penitentiary, a federal super-maximum security prison for male inmates located in Florence, Colorado, according to the US Department of Justice.
The US Penitentiary Administrative Maximum Facility, also known as ADX or "Supermax," has been called “a clean version of hell.” It is the most restrictive prison in the United States.
Prisoners spend about 23 hours a day in solitary confinement in small cells and walls thick enough to stifle any attempts of escaping. Some inmates, including convicted terrorists, are placed in a special section where even tighter restrictions are imposed.
A US Bureau of Prisons spokesman said that Tsarnaev eventually will be moved to Terre Haute in Indiana, a prison where federal death row inmates are executed.

Dzhokhar, 21, was sentenced to death by a US jury in May for helping his elder brother Tamerlan carry out the 2013 Boston Marathon attack that killed three people and wounded 264 others.
His death sentence does not mean he will face imminent execution. Defense attorneys are likely to appeal the sentence, but that would last for many years.
Tamerlan, 26, was killed on April 19, 2013, in a shootout with police in Watertown, Massachusetts.
Prosecutors have described Dzhokhar and Tamerlan, who are ethnic Chechens, as influenced by al-Qaeda.