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Undersea Drone Hunt for Malaysian Plane Foiled by Depth

A U.S. Navy underwater drone sent to search for a missing Malaysian jetliner on the floor of the Indian Ocean had its first mission cut short after exceeding its 4.5 km (2.8 mile) depth limit, Australian search authorities said on Tuesday. It had been expected to spend up to 16 hours scouring the silty sea floor, after a two-hour descent. "It's [the drone's] built-in safety feature returned it to the surface,'' the Australian agency coordinating the search and...

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