Deep-Water Search for Malaysia Airlines Flight 370 Resumes

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The search for Malaysian Airlines Flight 370 continued in the depths of the Indian Ocean with a torpedo-shaped robotic submarine going to work to map the ocean floor in hope of finding traces of the missing plane.

The Australian Maritime Safety Authority said the robotic sub Bluefin-21 was deployed on Tuesday night after deep ocean water ended its initial dive after just six hours.

The sub had been expected to search for 16 hours on Monday, but a built-in safety mechanism cut the journey short after the sub's depth limit of about 2.8 miles was reached, officials said.

Bluefin-21 is searching in the southern Indian Ocean about 1,000 miles off Australia’s west coast, an area of about the size of a medium city — 230 square miles — that officials think is the likeliest place the plane went down.

Acoustical signals believed to be from the aircraft’s black box or flight data recorder led searchers to the remote search area.

Bluefin-21 is capable of creating a three-dimensional sonar map of the area to chart debris on the sea floor. Still, no wreckage or physical trace of the plane has been found.

Analysis of data from Bluefin-21’s first mission showed “no objects of interest,” Australia’s Joint Agency Coordination Center said in a news release early Wednesday local time.

Some 11 military aircraft, three civil aircraft and 11 ships are assisting in the search for the plane, which vanished on March 8 with 239 people aboard.

— Jeff Black