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The Water Prison Exit Keys is one of the many keys that Henry Townshend comes across in Silent Hill 4: The Room. Henry finds the key hanging on a sign in the waterwheel room of the Water Prison World. The key, as it the name states, is meant to unlock the exit door of the Water Prison; however, Henry cannot really exit the water prison world by using the key. The door, instead, just leads to the exterior spiral walkway running the height of the tower, allowing Henry to enter the different levels of the prison.