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A robotic vehicle named Nereus has made the deepest ocean dive ever - 6.8 miles (10,902 meters), a team of scientists and engineers reported yesterday. At this depth, Nereus was able to explore the Challenger Deep - the ocean's lowest point, located in the Mariana Trench in the western Pacific.
Nereus took the plunge Sunday. It was the first exploration of the Marina Trench since 1998.