The mysterious underwater Ping Noise Finally recorded

The fear of the ocean and the deep is called thalassophobia, which in Greek literally means fear of the sea.  While humanity looks to conquer the solar system, we have only explored 5% of the ocean that covers more than 70% of our planet.  No one knows what kind of strange places or things may be found beneath.  While alternate historians suggest ancient civilizations, our own histories and mythologies are rich with encounters with undiscovered or unconfirmed cryptids, sentient species, and portals to strange places.  While the deepest depths of the ocean are as black as space, sound carries, and sometimes what we hear cannot be explained, giving us clues about what might be waiting below the surface.  These are five of the most mysterious underwater sounds ever captured.

https://www.youtube.com/watch?v=9iQeEpWeqRY