Underwater charge from thousands of miles. This is due to dispersion. Among the more vocal residents of the deep are the whales. Their calls can be detected thousands of miles from the source as they navigate the world's oceans. Below are a few examples of whale vocalization.
Whales are by no means alone in their symphonic calls.
Dolphins, fish, and even shrimp fill the sea with sounds not often heard ashore. Natural sources of sound also include non-living earth processes. The sound of seismic events fill the ocean, as does the sound of rain, lightning and the crackling of ice. Since the day man first ventured onto the sea, he has added the sound of his own activity to the ocean basins. As we built larger, and more powerful ships the seas became filled with the sound of cavitating propellers.