Operators prepare the Bluefin 21 sub for a new mission in the search for MH370. Source: Getty Images
THE minisub searching for missing flight MH370 has reached record depths well beyond its normal operating limits, officials said, as it dove on its fifth seabed mission.
With no results to show since the Boeing 777 carrying 239 people disappeared on March 8, Prime Minister Tony Abbott says there’ll soon be a rethink in the mission to locate the plane, which is believed to have crashed in a remote area of the Indian Ocean west of Perth.
Searchers have extended the hunt beyond the normal 4,500 metre depth range of the US Navy's Autonomous Underwater Vehicle (AUV), called Bluefin-21.
“The AUV reached a record depth of 4,695 metres during mission four,” the US Navy said. “This is the first time the Bluefin-21 has descended to this depth.
“Diving to such depths does carry with it some residual risk to the equipment and this is being carefully monitored,” a statement said.
Australia's Joint Agency Coordination Centre said the minisub had been deployed on a new mission as operations run round the clock.
“Data analysis from the fourth mission did not provide any contacts of interest,” it added.
The unmanned Bluefin-21 which maps the sea floor by sonar, has searched 110 square kilometres to date, JACC said.
The minisub, which hit a technical snag on Tuesday had also resurfaced Monday after breaching a pre-programmed maximum depth of 4.5 kilometres.
JACC said last night that the US manufacturer of the AUV, Phoenix International, had advised the risk was “acceptable”.
“This expansion of the operating parameters allows the Bluefin-21 to search the sea floor within the predicted limits of the current search area,” it said.
The Malaysia Airlines jet is believed to have crashed in the ocean after mysteriously vanishing while en route between Kuala Lumpur and Beijing.
Hopes for finding the plane have focused on the Bluefin-21 after signals believed to be from the plane's flight data recorders on the seabed fell silent in recent days.
The submersible is being deployed from an Australian vessel to scan an uncharted sea floor at extreme depths, but Mr Abbott said the Bluefin-21 would be given about a week as questions are asked about the massive costs.
“If we don't find wreckage, we stop, we regroup, we reconsider,” Abbott told the Wall Street Journal.
Both Mr Abbott and Malaysia's Transport Minister Hishammuddin Hussein vowed not to give up looking for the plane.
However suggestions have emerged that more sophisticated — and highly expensive — deep-diving equipment may be needed for the search.
“We have to look at contractors, and the cost of that will be huge,” Mr Hishammuddin told reporters in Kuala Lumpur, though he indicated that such concerns were not yet testing the resolve of multinational search partners.
“But in any event, the search will always continue. It's just a matter of approach.”
Analysts say the search will be the most expensive in aviation history, with Ravikumar Madavaram, an aviation expert at Frost & Sullivan Asia Pacific, estimating the bill at $100 million so far.
“This is definitely the biggest operation ever,” he said. “In terms of costs this would be the highest.” Visual searches of the ocean surface have failed to find any floating debris, and the JACC said an analysis of samples from an oil slick found at the weekend had determined it was not from MH370.
“If the current search turns up nothing, we won't abandon it, we will simply move to a different phase,” Mr Abbott said.
JACC chief Angus Houston said earlier this week that alternatives, including devices that can go deeper than the Bluefin-21, were “being looked at”, but he gave no specifics.
Air Chief Marshal Houston has repeatedly warned the search will be protracted and demand patience, particularly from distraught families of passengers, who still have no confirmation of what happened to their loved ones.
MH370 has drawn increasing comparisons to the effort to locate the underwater resting place of Air France flight 447, which crashed in the Atlantic in 2009.
It took nearly two years for AF447's flight data recorders to be recovered.
AFP
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