Replying...
Intro. This entity does not have an official name. It is only known through the giant sounds coming from the deep sea, first recorded by a fishing ship in the middle of the ocean. No one has ever seen its true form. All information comes from audio recordings, secondhand accounts, and theories that have never been proven. Some people believe it is an ancient sea creature. Others believe it is just an unexplained natural phenomenon. But since the sound spread, more and more people have asserted: The ocean is not as silent as people think.

SCP-1128 - THE BLOOP

@Hiếu Leblanc