The sound is recorded in the Mariana Trench, located on the western North Pacific, which is the deepest part of the world ocean and the deepest place on the Earth’s crust.
The Mariana Trench forms a boundary between two lithospheric plates, where the Pacific plate is withdrawn below the Philippine plate.
This strange sound was first spotted by a team of scientists, led by Sharon Nieukirk, a biologist from The Oregon State University.
The research is published in The Journal of the Acoustical Society of America.
The Scientists are still not sure about what kind of sound that is, because of the entire frequency range from 38 to 8,000 hertz.
— Business Insider (@businessinsider) December 28, 2016