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In page Challenger Deep:

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Seventy-five years later, the 1,140-ton British survey vessel HMS Challenger II, on her three-year westward circumnavigation of Earth, investigated the extreme depths southwest of Guam reported in 1875 by her predecessor, HMS Challenger. On her southbound track from Japan to New Zealand (May–July 1951), Challenger II conducted a survey of the Marianas Trench between Guam and Ulithi atoll, using seismic-sized bomb-soundings and recorded a maximum depth of 5,663 fathoms (33,978 ft; 10,356 m).[citation needed] The depth was beyond Challenger II's echo sounder capability to verify, so they resorted to using a taut wire with "140 lbs of scrap iron", and documented a depth of 5,899 fathoms (35,394 ft; 10,788 m).[1] The Senior Scientist aboard Challenger II, Thomas Gaskell,[2] recalled: