The Pistol Shrimp is the only known species that actively creates shock waves. By snapping its club-like claws it creates a high speed vortex ring, which induces a large pressure drop in its core. The resulting vaporization of liquid generates a cavitation ring which mechanism is known as the Bernoulli Principle. The oscillation of the cavitation vortex in turn creates periodic collapses and rebounds, emitting high pressure pulses of up to 10 bars at 30 m/s that are used by the Pistol Shrimp to communicate, defend itself, and to stun and kill its prey. Furthermore, these shock waves reach temperatures equivalent to the sun's surface and 218dB loud noises, which can be easily heard in the proximity of reefs.