Mysterious Formation In the Pacific Ocean

Natural Earth Formation or is it an Ancient Artificial Structure?

If it is a natural phenomenon what are the chances that the detailed shape of an arm, a wrist, a fistful of fingers, a thumb with thumbnails would appear as if someone has drawn them on the seabed of the earth stretching from Japan to the islands of Guam and Palau.  The formation is so large that it could cover both the Philippine and Japan islands combined.