An international search force resumed the hunt for missing Malaysia Airlines Flight MH370 in the remote southern Indian Ocean on Friday as authorities pored over satellite data to try and confirm a potential debris field.The Australian-led mission said it was sending five aircraft back to a storm-lashed area some 2,500 km (1,500 miles) southwest of Perth. The search began on Thursday after analysis of satellite images identified two large objects floating in the ocean there that may have come from the Boeing 777 which went missing 13 days ago with 239 people aboard.Investigators have said it is a credible lead but nothing beyond that. The search for the plane continues in other regions, including a wide arc sweeping northward from Laos to Kazakhstan.The investigators suspect Flight MH370, which took off from Kuala Lumpur for Beijing shortly after midnight on March 8, was deliberately diverted thousands of miles from its scheduled path. They say they are focusing on hijacking or sabotage but have not ruled out technical problems.A source close to the investigation said it might take "several days" to establish whether the objects spotted by satellite in the Indian Ocean came from the missing airliner.A former senior crash investigator said there had been false leads in many investigations, especially in waters containing stray containers or dumped and lost cargo.Three Australian P3 Orions would be joined by a high-tech U.S. Navy P8 Poseidon aircraft and a civilian Gulfstream jet to search the 23,000 square km zone on Friday, the Australian Maritime Safety Authority (AMSA) said. A Norwegian merchant ship that had been diverted to the area on Thursday was still searching there and another vessel would arrive later on Friday.China's icebreaker for Antarctic research, Xuelong, or Snow Dragon, will set off from Perth to search the area, Chinese state news agency Xinhua cited maritime authorities as saying.About two-thirds of the missing plane's passengers were Chinese nationals.Australia's acting Prime Minister Warren Truss said Australia continued to examine satellite footage to pinpoint the location of the suspected debris, which included a piece estimated from the satellite imagery to be 24 metres (79 feet) long."Clearly, there's a lot of resources being put into that particular area. It's broadly consistent with the flight plans that were talked about ever since the satellites and their work has been added to the information bank," Truss told ABC radio."That work will continue, trying to get more pictures, stronger resolution so that we can be more confident about where the items are, how far they have moved and therefore what efforts should be put into the search effort."DIRE WEATHERStrong winds, cloud and rain had made searching on Thursday difficult, said Kevin Short, an air vice marshal in New Zealand's Defence Forces, which sent a P-3K2 Orion to search the area."The crew never found any object of significance," he told Radio New Zealand. "Visibility wasn't very good, which makes it harder to search the surface of the water," he said.A nearby desolate group of French-administered sub-Antarctic islands including St. Paul and Amsterdam and Kerguelen had been asked to look for debris, but none had been spotted, said Sebastien Mourot, chief of staff for the French prefect of La Reunion.There have been many false leads and no confirmed wreckage found from Flight MH370 since it vanished off Malaysia's east coast, less than an hour after taking off.There has also been criticism of the search operation and investigation, as more than two dozen countries scramble to overcome logistical and diplomatic hurdles to solve the mystery.Investigators piecing together patchy data from military radar and satellites believe that, minutes after its identifying transponder was switched off as it crossed the Gulf of Thailand, the plane turned sharply west, re-crossing the Malay Peninsula and following an established route towards India.What happened next is unclear, but faint electronic "pings" picked up by one commercial satellite suggest the aircraft flew on for at least six hours.A source with direct knowledge of the situation said that information gleaned from the pings had been passed to investigators within a few days, but it took Malaysia more than a week to narrow the search area to two large arcs - one reaching south to near where the potential debris was spotted, and a second crossing to the north into China and central Asia.The four-day delay in identifying satellite images that may show debris was due to the vast amount of data that needed to be analysed by various agencies, Australian authorities and the U.S. company that collected the images said.The satellite images, provided by U.S. company DigitalGlobe , were taken on March 16, meaning that the possible debris could by now have drifted far from the original site.The relatively large size of the objects would suggest that if they do come from the missing aircraft, it was largely intact when it went into the water.Still, finding any debris, let alone the "black boxes" that could shed light on what happened, remains incredibly challenging in the remote, deep-sea region known as the Roaring 40s for its huge seas and frequent storm-force winds. - ReutersCurrents, winds could hit search for missing Malaysia jet's black boxesIf two blurred objects photographed from space are confirmed as debris from Flight MH370, scientists will still face a daunting task to find and recover the sensitive recorders containing clues to the Malaysian jet's disappearance.With so little known about why the Beijing-bound Malaysia Airlines flight changed course and disappeared after leaving Kuala Lumpur on March 8, finding the 'black boxes' is seen as the only real hope of understanding what happened to the plane and the 239 people on board.Australian Prime Minister Tony Abbott on Thursday said objects possibly belonging to the plane had been discovered in the Indian Ocean. The area is around 2,500 km (1,500 miles) southwest of Perth, above a volcanic ridge in waters estimated to be 2,500 to 4,000 metres (8,200 to 13,120 feet) deep.It roughly corresponds to the far end of a southern track the aircraft could have taken after investigators suspect it was deliberately diverted."It can be incredibly rough and difficult. It can be very windy with strong currents, though it can equally be calm," said David Gallo, director of special projects at the Woods Hole Oceanographic Institution (WHOI) in Falmouth, Massachusetts, referring to the general area where the objects were seen.Flight MH370's disappearance has been compared to the 2009 Air France jet disaster, which puzzled investigators until a mission led by WHOI found the black boxes in 3,900 metres (12,800 feet) of water.But whereas investigators knew roughly where Flight AF447 had hit the Atlantic Ocean on a stormy night in June 2009, search crews know much less about where the Malaysian jet ended up, including whether or where it ran out of fuel."If it is confirmed as debris, then the first priority is to recover and record each piece and see how high or low it is sitting in the water. This may help indicate how it has been moved by currents and winds," said Gallo, who took part in the Air France search.DEBRIS COULD HAVE MOVEDThe immediate problem will be to find the debris, which may have moved since the satellite images were taken on March 16.It could take several days to verify the satellite lead, a source close to the investigation said. Military aircraft from Australia, the United States and New Zealand have so far found nothing during a search hampered by strong winds and rain. Neither has a merchant ship in the area.If the objects - the biggest measures up to 24 metres (79 feet) - are from the Boeing 777, recovery teams will work as quickly as possible to locate the rest of the wreckage in the hope it leads them to the data and cockpit voice recorders.To do this, scientists have developed computer models to effectively play waves and winds backwards, allowing rescue workers to retrace the movements of debris to the site of a crash."There are sophisticated models that allow you to work backwards from the current position of each piece of debris, after considering the currents and the winds and so on," said Gallo."That enables you to say X marks the spot on the surface."Investigators hope such recent developments in oceanography will help shed light on the baffling disappearance of Flight MH370.But not all experts agree computer simulations will easily replace the gruelling routine of searching from the air and the sea.Although research has continued since the Air France jet ploughed into the Atlantic, a detailed annex to the report on that disaster, which was blamed mainly on pilot error, raised questions in 2012 over the consistency of such "retro-drift" calculations.For example, when the French Navy dropped special buoys at the same spot a year after the crash they scattered hundreds of miles apart, highlighting the turbulence of ocean currents.RACE AGAINST TIMEIf the report of suspected debris is confirmed, naval vessels will also drag a sonar through the water to seek the black boxes through radio beacons, but time for this is running out.The black boxes are designed to have a battery life of at least 30 days, leaving possibly only 17 days to locate them before the signals die.But for every knot, or nautical mile per hour, of current in the rough waters of the southern Indian Ocean, an object could theoretically float for 312 miles (500 km) in 13 days, the time the Malaysian plane has been missing.That could present investigators with a much larger potential search area than the 40-mile radius for AF447.In 2012, France's BEA air crash investigation agency recommended in its report on the Air France disaster that the battery life on locator beacons be increased to 90 days.Although this has been backed by global regulators, it will not become mandatory until towards the end of the decade.Other proposals that could potentially make it easier to find MH370 remain bogged down in talks between regulators and the aviation industry, with no timetable for putting them into effect, Reuters reported last week.These include adding a new frequency for the beacons so that their signals travel further and can more easily be heard by military ships lacking specialist air crash recovery equipment.Existing signals travel about 2,000 to 3,000 metres (6,560 to 9,840 feet) under water, according to the French sea search annex, whereas the area now being combed for debris is up to 4,000 metres deep.To close this gap, search teams would bring in boats capable of carrying several miles of cables to drag sonars at lower depths, but experts note moving them into place can take time.If by the end of 30 days nothing is found, the search could rely on remote underwater vehicles to scour the seabed.To find the Air France wreckage, WHOI used remote-operated REMUS underwater vehicles developed by the U.S. Navy."It was the biggest use of deep-ocean firepower in one spot," Gallo said.
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