In the high security wing of a prison is to bathe a prisoner. For this purpose it is conducted in a special cell. This is exactly 1.80 meters long, 1.80 meters wide and 2.60 meters high. It contains a tub with 250 liters capacity, which is set in concrete. The room has no windows and only one Door. This is made of steel and completely waterproof. In the center of the ceiling is a circular ventilation shaft with 12 cm diameter and removable grille. The guards told the prisoners that he comes back in exactly 3 hours and pick him up. When the prisoner shortly after turning up the tap, but breaks off the handle and he can not leave the water. The water flows constantly at 60 liters per minute, and the steel door is escape proof. What can he do to prevent it from drowning?
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