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How accurately can we measure the ocean’s deepest point?

Researchers mapped the Challenger Deep using the EM124 multibeam echosounder, finding a preferred estimate of 10,927 m, which highlights the importance of sound-speed models, vessel speed, and survey conditions. The study's dataset is publicly available, allowing for further validation and comparison with other observations.

SourceResearch Organization of Information and Systems·JournalScientific Data·TypeObservational study·DateSep 17, 2026