In 1960, U.S. Navy Lt. Don Walsh and Swiss oceanographer Jacques Piccard descended to the Challenger Deep, the lowest elevation on Earth. This video from the U.S. Navy, featuring an interview with Walsh, chronicles the dive on its anniversary.
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Unsinkable Don Walsh
Unsinkable Don Walsh Article

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Earth science, Engineering, Social Studies

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Don Walsh reached the deepest known part of the ocean in 1960, and then helped James Cameron reach the same place in 2012.