Some of the bank boxes in the wall broke open as more water rushed into the vault. Soon, piranhas began to swim out of those open boxes and into the large pool in the vault. Some began to bite at Mary's legs, others went for her arms. Their teeth were sharp, much like razor blades. These were not robotic, they were REAL Piranhas!

But if Mary got a chance to see, the boxes the piranhas came out of revealed a structure on the other side of the vault, meaning the wall of boxes was actually a weak point in the structure of the vault!