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In 1960, two explorers descended nearly seven miles into the Mariana Trench and entered the deepest known place on Earth

In January of 1960, oceanographer Jacques Piccard and U.S. Navy Lieutenant Don Walsh descended into the Mariana Trench aboard a specially designed deep-sea submersible called the Trieste. The ...
CNN

6 incredible facts about the Challenger Deep, the deepest point on Earth

Editor’s note: Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Just as Earth’s land surface has ...