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Malaysia Airlines Flight 370: Cell phone clue emerges as pings go silent

his yellow object is the Bluefin-21, an underwater drone that can scour the ocean bed, looking for signs of wreckage.
Credit: Will Ripley/David Molko/CNN
Source: CNN

Holly Yan and Catherine E. Shoichet

(CNN) -- The phone of the co-pilot of Malaysia Airlines Flight 370 was on and made contact with a cell tower in Malaysia about the time the plane disappeared from radar, a U.S. official told CNN on Monday.

However, the U.S. official -- who cited information shared by Malaysian investigators -- said there was no evidence the co-pilot, Fariq Abdul Hamid, had tried to make a call.

The official told CNN's Pamela Brown on Monday that a cell-phone tower in Penang, Malaysia -- about 250 miles from where the flight's transponder last sent a signal -- detected the co-pilot's phone searching for service around the time the plane vanished from radar.

The details do appear to reaffirm suggestions based on radar and satellite data that the plane was off course and was probably flying low enough to obtain a signal from a cell tower, the official said.

The revelation follows reporting over the weekend in a Malaysian newspaper that the co-pilot had tried to make a telephone call while the plane was in flight.

Asked Sunday by CNN about the newspaper report about a purported effort to make a call by the co-pilot, Malaysia's acting transport minister Hishammuddin Hussein said, "As far as I know, no, but as I said that would be in the realm of the police and the other international (authorities) and when the time comes that will be revealed. But I do not want to speculate on that at the moment."

Efforts to find missing Malaysia Airlines flight 370 focused beneath the choppy surface of the Indian Ocean on Monday as Australian authorities sent a U.S. Navy submersible diving toward the sea floor in a bid to find the jetliner and the 239 people aboard it.

Meanwhile, new clues emerged above the surface, as investigators reported finding an oil slick in the search zone and a U.S. official revealed that a Malaysian cell phone tower detected the co-pilot's phone around the time of the disappearance.

The decision to put the Bluefin-21 autonomous underwater vehicle into the water for the first time in the 38-day search comes nearly a week after listening devices last heard sounds that could be from locator beacons attached to the plane's "black boxes."

"We haven't had a single detection in six days," Australian chief search coordinator Angus Houston said. "It's time to go underwater."

The probe is equipped with side-scan sonar -- acoustic technology that creates pictures from the reflections of sound rather than light. Such technology is routinely used to find sunken ships and was crucial in finding Air France Flight 447, which crashed into the Atlantic Ocean in 2009.

Houston cautioned against hopes that the underwater vehicle will find wreckage of the plane, which disappeared on March 8 on a flight between Kuala Lumpur, Malaysia, and Beijing.

"It may not," he said. "This will be a slow and painstaking process."

It will take the probe and its operators 24 hours to map each portion of the search area -- two hours to descend, 16 hours to map, another two hours to rise to the surface and four hours for operators to download and analyze the information.

The first mission will cover an area 5 kilometers by 8 kilometers (3.1 miles by 4.9 miles). It will take up to two months to scan the entire search area.

The bottom of the search area is not sharply mountainous -- it's more flat and almost rolling, Houston said. But he said the area probably has a lot of silt, which can "complicate" the search.

Earlier, Australian officials announced the Australian ship Ocean Shield had detected an oil slick Sunday evening. It is unclear where the oil came from. A 2-liter sample has been collected for examination, but it will take a few days to analyze.

"I stress the source of the oil has yet to be determined, but the oil slick is approximately 5,500 meters (3.4 miles) downwind ... from the vicinity of the detections of the TPL on Ocean Shield," Houston said, referring to the pings detected by a towed pinger locator, a wing-shaped listening device connected to the ship by a cable.

It's not the first oil slick detected as part of the search. A similar find in the first days of the search was determined to be fuel oil from a freighter.

Surface search nearing end

Twelve aircraft and 15 ships participated in Monday's search efforts on the surface, covering an 18,400-square-mile (47,600-square-kilomter) area. The surface search was among the last, Houston said.

"The air and surface search for floating material will be completed in the next two to three days in the area where the aircraft most likely entered the water," Houston said.

That search was energized last week when searchers using the Navy-owned pinger locator and sonobuoys detected sounds that could have been from the plane's black boxes, or data and voice recorders.

But after a week of silence, the batteries powering the locator beacons are probably dead, a top official from the company that manufactures the beacons told CNN on Sunday. They were certified to last 30 days, a deadline that's already passed.

That means searchers may not be able to detect any more pings to help lead them to those pieces of the missing plane.

"More than likely they are reaching end of life or already have. If (a beacon) is still going, it is very, very quiet at this point," Jeff Densmore told CNN's "State of the Union with Candy Crowley" on Sunday.

The time is ripe to move on to other search techniques.

"Every good effort has been expended, but it's now looking like the batteries are failing, and it's time to start mowing the lawn, as we say, time to start scanning the sea floor," said Rob McCollum, a CNN analyst and ocean search specialist.

Catherine Tamoh Lion, the mother of the missing plane's chief steward Andrew Nari, said the news that no more pings have been heard is upsetting.

"Our sadness is now just prolonged," she told CNN.

"I feel like they are somewhere," she said of the passengers. "I don't know where. Just praying to God. Miracles can happen. "

CNN's Tom Watkins, Steve Almasy, Sumnima Udas, Christine Theodorou and Nic Robertson contributed to this report.

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