Don Walsh (November 2, 1931 – November 12, 2023) was an American oceanographer, U.S. Navy officer and marine policy specialist. While aboard the bathyscaphe Trieste, he and Jacques Piccard made a record maximum descent in the Challenger Deep on January 23, 1960, to . Later and more accurate measurements have measured it at . Lt. Don Walsh, USN (bottom) and Jacques Piccard (center) in the bathyscaphe Trieste Wikipedia
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