Only 0.001 percent of the deep ocean floor has ever been seen by human eyes — an area roughly the size of Rhode Island — according to a May 2025 study in Science Advances, meaning more than 99.999 percent of the seafloor covering two-thirds of our planet has never been observed by anyone, ever

The deep ocean covers approximately two-thirds of the Earth’s surface. By the standard scientific definition, it begins at 200 metres below sea level — the depth at which sunlight effectively stops penetrating — and extends to the bottom of the deepest ocean trenches, more than 11,000 metres down. The total area of this deep-sea floor [...] The post Only 0.001 percent of the deep ocean floor has ever been seen by human eyes — an area roughly the size of Rhode Island — according to a May 2025 stu