Deepest point in the ocean on earth is the Challenger Deep in the Mariana Trench.
In 2010, United States Center for Coastal & Ocean Mapping measured the depth at 10,994 meters (36,070 feet) below sea level with an estimated accuracy of ± 40 meters.
If the highest mountain on the earth, Mount Everest were to be placed at this location it would be covered up by over one mile of water.
However the first ever depth measurement in the Mariana Trench was made by the British survey ship HMS Challenger. This ship was used by Royal Navy in 1875 to conduct research on trench. At that time the measured depth was 8,184 meters (26,850 feet) which was the greatest measurement at time.
After 76 years, In 1951, another Royal Navy vessel, also names as HMS Challenger went for even more accurate measurement. The depth of 10,900 meters (35,760 feet) was recorded by echo sounding technology.
Royal Navy vessel named that as The Challenger Deep after this measurement.
While in 2009, sonar mapping done by the RV Kilo Moana, operated at University of Hawaii determined the depth to 10,971 meters (35,994 feet) with ± 20 meters as potential errors.
In 2010, United States Center for Coastal & Ocean Mapping measured the depth as 10,994 meters (36070 feet) with ± 40 meters as potential errors.
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