But one thing you never want to hear while you're below the surface is the piercing 'ping' of an active submarine sonar. Accidentally subjecting your ears to this sound can not only startle you during ...

But in the case of a catastrophic crash or explosion in an ocean—such as a plane crashing or a submarine exploding—there’s a distinct pressure signal, more commonly known as a sound wave.

At least six tourists were killed on Thursday morning in a Red Sea recreational tourism reef exploration submarine, which crashed less than a mile off the coast of Hurghada, Egypt. The incident ...