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@alien_god_same: More than 80 % of the ocean has never been mapped , explored , or even seen by humans . The Mariana Trench is the deepest part of the world's oceans . To date only three people have reached the bottom and returned to the surface alive . 12 People have traveled to the surface of the Moon . This is four times as many as have been to the Mariana Trench on Earth . While the Moon seems more difficult to reach , it's easier to stay once there , and it's easy to orbit . We have plenty of very detailed maps of the Moon , but none of the deep undersea . So we can say we know the Moon better than the undersea . Follow - @alien_god_same