Piranha 3D (18)

Lake Victoria is a tranquil beauty spot until the spring break when the population of 5,000 increases tenfold with the arrival of fun-seekers and tourists keen to cool off in the waters. However, the holiday makers get a lot more than they bargained for when an underwater tremor unleashes a school of prehistoric, man-eating fish. The voracious creatures attack people in the water without mercy and a small group of survivors band together to outwit the predators.