An AirAsia jet that crashed two weeks ago likely experienced an explosion before hitting water due to a significant change in air pressure, a senior government official has said.
However, an Indonesian transport safety investigator said there is no data to support the theory.
Flight QZ8501, with 162 people on board, lost contact with air traffic control in bad weather on 28 December.
It was less than halfway into a two-hour flight from Indonesia's second-biggest city of Surabaya to Singapore.
"My analysis is, based on the wreckage found and other findings, the plane experienced an explosion before it hit the water," Supriyadi, operations coordinator at the National Search and Rescue Agency, told reporters.
He said the left side of the plane seemed to have disintegrated, pointing to a change in pressure that could have caused an explosion.
Navy divers have retrieved the black box flight data recorder from the airliner.
"At 7:11, we succeeded in lifting the part of the black box known as the flight data recorder," Fransiskus Bambang Soelistyo, the head of the National Search and Rescue Agency, told a news conference.
The second black box with the cockpit voice recorder has been located, based on pings from its emergency transmitter, but not yet retrieved, Madjono Siswosuwarno, the main investigator at the National Transportation Safety Committee, said.
Officials hope the black boxes, found near the wrecked wing of the plane, will reveal the cause of the crash.
The national weather bureau has said seasonal storms were likely a factor.
The recorders are expected to be taken to the capital, Jakarta, for analysis and it could take up to a month to get a complete reading of the data.
Officials did not provide details of the condition of the black boxes.
"The download is easy, probably one day. But the reading is more difficult ... could take two weeks to one month," Siswosuwarno said.
Over the weekend, three vessels detected "pings" that were believed to be from the black boxes, but strong winds, powerful currents and high waves hampered search efforts.
Dozens of Indonesian navy divers took advantage of calmer weather in the Java Sea today to retrieve the flight recorder and search for the fuselage of the Airbus A320-200.
Forty-eight bodies have been retrieved from the Java Sea and searchers believe more will be found in the plane's fuselage.
Relatives of the victims have urged authorities to make finding the remains of their loved ones the priority.
Indonesia AirAsia, 49% owned by the Malaysia-based AirAsia budget group, has come under pressure from authorities in Jakarta since the crash.
The transport ministry has suspended the carrier's Surabaya-Singapore licence for flying on a Sunday, for which it did not have permission.
However, the ministry has said this had no bearing on the crash of Flight QZ8501.
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