In Iraq if a US prisoner has to chill out for awhile, they put him in a "segregation box" that is 3 feet deep and 6 feet tall. You read that measurement correctly. A prisoner is not able to lay prone (and not allowed to stand fully erect if over 6 feet tall). He can only stand or sit as long as he is in the box.
Our military defines this cell as humane.
It seems our depravity knows no bounds.