Australian Prime Minister Tony Abbott said on Monday that the hunt for missing flight MH370 entered a new phase with seabed search to be expanded to a much larger area.

"If necessary, of the entire probable impact zone which is roughly 700 kilometers by 80 kilometers," Abbott said at a press conference after U.S. submarine drone Bluefin-21 completed a sea floor search of a focused area in the Indian Ocean and found no contacts of interest.

The focused area was defined as a circle of 10 km radius around the spot where the second suspicious signal of aircraft black boxes was heard on April 8.

Abbott said it is highly unlikely to find any aircraft wreckage on the ocean surface at this stage, indicating the visual search currently conducted by airplanes and vessels may be called off.

Fifty-two days have passed since the Malaysian Airlines flight disappeared en route from Kuala Lumpur to Beijing on March 8, but nothing related to the plane has been found.

Abbott said the new phase of search would be focused on the sea bed of the expanded area, which would involve commercial contractors specialized in deep ocean search and may take six to eight months if weather conditions permit.

Contractual equipments could be deployed in weeks and the Bluefin-21 would continue its mission in adjacent areas, he added.

Acknowledging that it is possible to never find the ill-fated plane, Abbott vowed to continue the search as thoroughly as "humanely possible."

Despite the fruitless search in the past weeks, Abbott said he still has considerable degree of confidence that the signals detected by U.S.-supplied towed pinger locator came from aircraft black boxes.

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