Mariana Trench. Imagine the deepest, darkest place on Earth—an underwater trench plummeting to a depth of 35,800 feet, nearly seven miles below the ocean surface. The Mariana Trench is one of the least explored places on Earth.
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Nobody has walked on the bottom of the Mariana trench, but six people have descended to it in submersibles.
Leading into the ocean there are continental slopes, made up of granite, and sedimentary rocks that have been formed by pressure applied to sediment. Deeper in the ocean, the floor (beneath sand and sediment) is made up almost completely of mafic oceanic crust, mainly basalt and gabbro.
In the Pacific Ocean, somewhere between Guam and the Philippines, lies the Marianas Trench, also known as the Mariana Trench. At 35,814 feet below sea level, its bottom is called the Challenger Deep — the deepest point known on Earth.