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to the south and west of the eastern basin, and recorded depths between 5093 and(-) 7182 m. Another miss. On Mariana Expedition Leg 8, under chief scientist Yayanos, Thomas Washington was again involved, from 12 to 21 December 1978, with an intensive biological study of the western and central basins of the Challenger Deep. Fourteen traps and pressure-retaining traps were put down to depths ranging from 10455 to(-) 10927 m; the greatest depth was at . All of the 10,900-plus m recordings were in the western basin. The 10455 m depth was furthest

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