The stone chambers were similar to chimneys and measured 75 x 80 cm (29.5 x 31.5 inches).[note 1] There was a small hatch on top for air, and a narrow door with an iron bar bolted to the cell. The intensified punitive measure saved room and reinforced the punitive agony. There were also standing cells at the Allach subcamp, where the cells were smaller than at Dachau.