Scientists have discovered what they believe is the loudest possible underwater sound. So Strong it Vaporizes Water! Check it out...
"It's not the sound of a massive underwater earthquake, nor is it the sound of a pistol shrimp snapping its claws louder than a Pink Floyd concert. It is, in fact, the sound of a tiny water jet — about half the width of a human hair — being hit by an even thinner X-ray laser."