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Oceanographer Alan Churchill Jones during the Capricorn Expedition (1952-1953), shown here working on a wave recorder. This expedition mapped seamounts and guyots and other features of the Pacific seafloor. Scientists studied the 35,400 foot deep Tonga Trench, the second deepest place in the ocean, and measured heat flow on the East Pacific Rise. 1952.

Oceanographer Alan Churchill Jones during the Capricorn Expedition (1952-1953), shown here working on a wave recorder. Thi...