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By Phil Helsel

Convicted Boston Marathon bomber Dzhokhar Tsarnaev has been transferred to a Colorado supermax prison, according to federal prison records.

The Bureau of Prisons on Friday listed Tsarnaev, 21, as being housed in the United States Penitentiary Administrative Maximum Facility in Florence, Colorado.

Tsarnaev was convicted in April and sentenced to death on June 24 for the terror attack that killed three people on April 15, 2013. He was flown from the Federal Medical Center in Massachusetts to the Federal Correctional Institution in Florence, Colorado, after the sentence was handed down.

The United States 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 America.

Prisoners spend about 23 hours a day in solitary confinement in 12-by-7-foot cells with a single 4-inch-wide window and walls thick enough to stifle any attempts at communication. A slot in the door is used to deliver meals and for any visits. Some inmates, including convicted terrorists, are placed in a special section where even tighter restrictions are imposed.

Tsarnaev is expected to ultimately end up on federal death row at the U.S. Penitentiary in Terre Haute, Indiana.