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On the surface, the ROV pilots would be supported by a vast array of hardware-including support vessels-as well as crew that could number more than 100, senior salvage master Wytse Huismans of high-profile global operator SMIT Salvage told AFP. "But once you get into a position on the seabed, it's remarkable the dexterity of these ROVs in terms of what they can do," he added. Mearns said such underwater journeys could take several hours with the overall mission possibly lasting up to half a year. Larger parts such as the jet's wings can be brought to the surface using baskets or slings. The submersible-remotely driven by pilots on a surface ship-has two manipulator arms that function like "human hands" and can retrieve smaller objects, added deep-sea shipwreck hunter David Mearns. Machines that can operate at such extremes include deep-ocean operator Odyssey Marine Exploration's remotely-operated vehicles That expedition would require cutting-edge technology, likely last months and potentially cost more than the maximum US$70 million reward Malaysia is offering Ocean Infinity, according to deep-ocean salvagers. "(But) the benefits to the manufacturers of the aeroplane, operators and the families are that if you actually locate the wreckage, it's worthwhile to go ahead and take the next step and recover it."
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"They (searchers) are working at the extreme edge of what's capable," South African salvage master Nick Sloane, who led the operation to recover the stricken Italian cruise ship Costa Concordia, told AFP.
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If the wreckage is located in treacherous terrain up to six kilometres (19,685 feet) deep-far off Western Australia and north of the earlier search site-experts say high-tech underwater robots can handle the demands of recovery. Yet a new probe now underway by private firm Ocean Infinity-commissioned by Malaysia on a "no find, no fee" basis-has revived hopes the doomed plane might be found. The disappearance of the Boeing 777 carrying 239 passengers and crew almost four years ago is one of aviation's greatest mysteries, with an Australian-led hunt across a 120,000 square-kilometre (46,000 square-mile) zone failing to reveal the crash site.