Via the New York Post:

The torture was constant. The Americans were thrown in tiny cells, slabs of concrete for beds, single, bare lightbulbs making sleep impossible. They were in a constant state of starvation, and when they were fed, their watery soup was laced with pebbles or feces. They were made to stand on stacked stools for days on end. They were often strapped down by 15-pound leg irons, which caused lacerations and infection, or by stocks at the ends of their beds, which kept them on their backs for days. The walls and floors were overrun with roaches and rats. When they were strapped down, they were forced to lie in their own excrement.