Two girls are trapped in an elevator in a flooded building. They need a key to access the roof. One of them saw the keys near the elevator doors, but she does not remember which floor. But the elevator is still working and they have to check the lower floors to find the keys.

Two girls are trapped in an elevator in a flooded building. They need a key to access the roof. One of them saw the keys near the elevator doors, but she does not remember which floor. But the elevator is still working and they have to check the lower floors to find the keys.