What punishments did the prisoners get when they arrived and stayed there?

Prisoners who made trouble could end up in restricted cells, where they didn't have access to the library and had fewer hours of exercise. If they were really bad, there was "the hole", solitary confinement in a special cell, with no furnishings, light, and a restricted diet.

Solitary confinement. Restricted diet. Little exercise. Darkness. It's a interesting place to visit.