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With no new underwater signals detected, Australian Prime Minister Tony Abbott said Saturday that the massive search for the Malaysian jet would likely continue "for a long time'' as electronic transmissions from the dying black boxes were fading fast.
Abbott appeared to couch his comments from a day earlier while on a visit to China, where he met President Xi Jinping. He said Friday he was ``very confident'' signals heard by an Australian ship towing a U.S. Navy device that detects flight recorder pings are coming from the Boeing 777.
He continued to express this belief on Saturday, but added that the job of finding the plane that disappeared March 8 en route from Kuala Lumpur to Beijing remains arduous.
``No one should underestimate the difficulties of the task still ahead of us,'' he said on the last day of his China trip. We have ``very considerably narrowed down the search area, but trying to locate anything 4.5 kilometers beneath the surface of the ocean about 1,000 kilometers from land is a massive, massive task and it is likely to continue for a long time to come,'' Abbott said.
After analyzing satellite data, officials believe the plane with 239 people aboard flew off course for an unknown reason and went down in the southern Indian Ocean off the west coast of Australia.
Search crews are scrambling because the batteries powering the recorders' locator beacons last only about a month, and that window has already passed. Finding the devices after the batteries die will be extremely difficult due to the extreme depth of the water in that area.
Two sounds heard a week ago by the Australian ship Ocean Shield, towing the ping locator, were determined to be consistent with the signals emitted from the black boxes. Two more pings were detected in the same general area Tuesday.
``Given that the signal from the black box is rapidly fading, what we are now doing is trying to get as many detections as we can,'' Abbott said. ``So that we can narrow the search area down to as small an area as possible.''
The underwater search zone is currently a 1,300-square-kilometer (500-square-mile) patch of the seabed, about the size of the city of Los Angeles.
The searchers want to pinpoint the exact location of the source of the sounds _ or as close as they can get _ and then send down