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A U.S. Navy MH-60R Sea Hawk helicopter returns after searching for the missing Malaysian jet in the Gulf of Thailand. / U.S. Navy, Getty Images

To solve one of the most vexing mysteries in aviation history, the search for missing Malaysia Airlines Flight 370 will focus on what may lie underwater ?? in an area nearly as big as West Virginia.

Wednesday, the U.S. Navy's Bluefin 21 completed its last underwater mission near where acoustic signals, possibly emitted from the missing jet's data recorders, were picked up in April, according to the Australian-based Joint Agency Coordination Center.

"The Australian Transport Safety Bureau (ATSB) has advised that the search in the vicinity of the acoustic detections can now be considered complete,'' the JACC said in a statement, "and in its professional judgment, the area can now be discounted as the final resting place of MH370.''

Experts will work on determining an underwater search area of up to 21,600 square miles along the arc in the southern Indian Ocean, and an underwater survey of the ocean floor will map the terrain.

"Knowing the seafloor terrain is crucial to enabling the subsequent underwater search,'' the JACC said.

It will be roughly three months before that intensified search can begin. It could be a year before the underwater search ends and answers emerge.

"The search will be a major undertaking," Martin Dolan, chief commissioner of the Australian Transport Safety Bureau, which has been assisting the Malaysian government, said in a statement posted Monday. "The complexities and challenges involved are immense but not impossible. The best minds from around the world have been reviewing, refining and (localizing) the most likely area where the aircraft entered the water, which is why we remain confident of finding the aircraft.''

Flight 370 disappeared March 8 as it headed from Kuala Lumpur to Beijing with 227 passengers and 12 crewmembers on board.

Investigators from various countries joined to launch one of the most extensive searches by air and by sea. The focus in recent weeks has been on the southern Indian Ocean. Not a trace of the vanished jet has been found.

The survey of the ocean floor was begun by a Chinese ship. It will be joined by another vessel in June.

The underwater search is likely to begin in August. Commercial side-scan sonar operators will scour the ocean for the missing Boeing 777 and any debris.

Robert Mann, an aviation analyst at R.W. Mann in Port Washington, N.Y., says he feels that the jet will be found, but perhaps not by those so vigorously trying to discover it.

"I think it'll be found, there's no question about that ,'' he says. "It's just a matter of time. Ultimately, it may not be found by the people who are looking for it. It may be found as a byproduct of some other activity going on. That's the unfortunate part. I think the directed search, given the best efforts of those involved, is no more or less likely to find it than it was the other day.''

U.S. Navy spokesman Chris Johnson has dismissed comments made to CNN by ocean engineering expert Michael Dean that the acoustic "pings" heard in the area in April did not come from the missing airliner's black boxes. Dean said those sounds came from another source not connected to the jet.

"Mike Dean's comments today were speculative and premature," Johnson said in a statement.

Contributing: The Associated Press



Copyright 2014 USATODAY.com

Read the original story: Search for Malaysia Flight 370 moves to new area

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