Acoustic pulses travel great distances in the ocean because they are trapped in an acoustic “wave guide”. This means that as acoustic pulses approach the surface they are turned back towards the bottom, and as they approach the ocean bottom they are turned back towards the surface. The ocean conducts sound very efficiently, particularly sound at low frequencies, i.e., less than a few hundred Hz.

Hey Dolphin Hugger,
You’re a wave.
I want to know about the life and times!