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A look at Jared Loughner's probable new home: The federal supermax prison in Florence, Colo.

Charles Samuels and Dick Durbin

Office of Senator Dick Durbin

Charles Samuels, Director of the Federal Bureau of Prisons (Left) shakes hands with Senator Dick Durbin.

Jared Loughner pleaded guilty Tuesday after being found mentally competent in connection with the shooting rampage in Tucson, Ariz., that killed six people and wounded former Rep. Gabriel Giffords.

He'll likely find himself serving life in prison among the country's most notorious criminals in the federal supermax in Florence, Colo. Loughner was also sent to the prison for mental health evaluations earlier in his case. 

Florence ADX is known as the most secure, restricted prison in the country. It houses, among others, Unabomber Theodore Kaczynski, 9/11 conspirator Zacarias Moussaoui and Terry Nichols, a conspirator in the Oklahoma City bombing.

The environment there has been characterized as harsh. During Moussaoui's sentencing trial, a prison expert testified that inmates in the supermax essentially "rot" over time. The prison, he said, was designed for incapacitation and nothing else.