Two prisoners are locked in a dirt floor cell with nothing but a mattress, a frame, and a stolen spoon. There is a small, bar less window high on the wall, but they can not get to it. First, they try to tunnel out, but decide that it is too much work and will attract attention. Then, they attempt to get out by climbing on the mattress and frame, then climbing on one another, but still are unable to reach the window. They eventually escape.
How do they get out?
Hint: They do not rearrange the mattress.