CNN) -- Australia's Prime Minister on Saturday reiterated his "high degree of confidence" that acoustic signals picked up by searchers in the Indian Ocean are from the missing Malaysian plane's black box.
But Tony Abbott warned that locating the flight data recorders beneath nearly three miles of water would be a "massive, massive task."
"It is likely to continue for a long time to come," he told journalists in China, where he is on a diplomatic visit.
He applauded his nation's work in handling the operation, saying Chinese officials appreciate Australia's "transparency and candor" in the search for missing Malaysia Airlines Flight 370.
"I think it's to our country's credit that we've approached it that way," Abbott said.
Optimism all around
Thirty-six days since the plane vanished, the search continues, unabated.
Up to nine military aircraft, one civil aircraft and 14 ships will assist in Saturday's search for the airliner, Australia's Joint Agency Coordination Centre said. The center of the 16,000 square-mile search area lies about 1,448 miles northwest of Perth.
The U.S. Navy commander leading the American effort to find Malaysia Airlines Flight 370 said he's "optimistic" about how the search is proceeding.
The pings were continuous and consistent with what a black box would emit, said Cmdr. William Marks. "We've ruled out that it was anything natural, or anything from commercial shipping, or anything like that."
"I agree with the Prime Minister," Marks said. "We're optimistic."
On Saturday, searchers looking for pinger signals will continue to drag a towed ping locator at walking pace through the water in hopes of picking up a new signal, Marks said.
"We have to stick with the TPL for just a little while longer to make sure we have exhausted every ounce of power coming from the battery through the black boxes," he said.
Once the signals cease, searchers will lower a sonar device, a Bluefin-21, into the ocean to scour for remnants of MH370.
The Bluefin's pace is even slower and more painstaking than that of the ping locator, he said. That is why it is important to analyze more pings to narrow down its search area for the black boxes.
Four pings, one dud
Over the past week, the ping locator towed by the Australian vessel Ocean Shield has picked up four pings have been detected.
It first picked up two sets of underwater pulses April 5 that were of a frequency close to that used by the locator beacons. It heard nothing more until Tuesday, when it reacquired the signals twice.
The four signals were within 17 miles of one another.
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