The cinderblock room is stark. A dull metal bunk is mounted to the wall. A toilet, sink and writing shelf are affixed to other walls. A stool is bolted to the floor.
Inmates spend about 20 hours a day locked in their cells. Whenever they are on the grounds, 372 high definition cameras record their every move, 24 hours a day, a prison source tells PEOPLE.
Such is life in Souza-Baranowski Correctional Center, a maximum security prison about 40 miles west of Boston.