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Retired Capt. Don Walsh recounts his journey to the Mariana Trench aboard the Trieste in Jan. 23, 1960.

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Retired U.S. Navy Capt. Don Walsh—one of two men to first venture to the deepest part of the ocean—speaks at a Jan. 23 event commemorating the 60th anniversary of the Trieste dive.

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Retired U.S. Navy Capt. Don Walsh—one of two men to first venture to the deepest part of the ocean—speaks at a Jan. 23 event commemorating the 60th anniversary of the Trieste dive.

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