JAKARTA, Indonesia -- Indonesian navy divers scoured the floor of the Java Sea on Monday as they hunted for the black boxes of a Sriwijaya Air jet that nosedived into the water over the weekend with 62 people aboard.
The Boeing 737-500 jet disappeared minutes after taking off from Jakarta, Indonesia's capital, during heavy rain Saturday, and the search so far has yielded plane parts and human remains but no sign of survivors.
Authorities have said signals from the boxes containing the cockpit voice and flight data recorders were detected between Lancang and Laki islands in the Thousand Island chain just north of Jakarta. Officials said they have marked a location where the sounds were being emitted from the black boxes, which detached from the tail of the aircraft when it plummeted into the sea.
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The cockpit voice recorder holds conversations between pilots, and the data recorder tracks electronic information such as airspeed, altitude and vertical acceleration. When found, they will be handed over to the National Transportation Safety Committee overseeing the crash investigation.
More than a dozen helicopters, 53 navy ships and 20 boats, and 2,600 rescue personnel have been searching since Sunday and have found parts of the plane in the water at a depth of 75 feet, leading rescuers to continue searching the area.
National Search and Rescue Agency chief Bagus Puruhito said divers using high-tech "ping locator" equipment were looking for an identified target beneath 65 feet of seabed mud.
Television footage showed landing gear, wheels and a jet engine among the parts found, while other rescuers brought several body bags containing human remains to a police hospital in eastern Jakarta for identification.
Searchers have sent 17 body bags containing human remains to police identification experts, who on Monday said they'd identified their first victim, a 29-year-old man, Okky Bisma, a flight attendant.
The transport committee's chairman, Soerjanto Tjahjono, said the black boxes could provide valuable information to investigators. Once found and taken to the investigators' facility, it will take three to five days to dry and clean the devices and to download the data, Tjahjono said.
Tjahjono ruled out a possible midair breakup after seeing the condition of the wreckage found by searchers.
He said the jet was intact when it plunged and broke into pieces upon impact with the water. The debris was concentrated in one area, while a midair explosion would spread debris over a large area, he said.
"It was broke[n] apart naturally upon impact with water ... there is no indication of unnatural destruction or explosion so far," Tjahjono told The Associated Press. "However, this still has to be confirmed by reading the black boxes."
The committee's investigator, Nurcahyo Utomo, said they have collected recordings and transcripts of the conversation between the pilot and air traffic controllers.
Utomo said his team is still examining radar data on the plane's movements and interviewed the air traffic officers who were in charge of controlling the crashed flight. More interviews of witnesses, including with the airlines' technicians, fishermen and experts, will commence in the near future.
Investigators are investigating all parts of the plane found by searchers from the seafloor such as the ground proximity warning system, a device that could warn the pilot if the plane is too close to the ground, a radio altimeter and several other parts mostly from the lower side of the aircraft's tail, Utomo said.
He said Singapore's Transport Safety Investigation Bureau will help his committee in searching for the black boxes and the U.S. National Transportation Safety Board will join in investigating the crash.
The committee is expected to publish a preliminary investigation report of the crash within a month and a final report about a year later.
Indonesian navy Chief Adm. Yudo Margono said tons of sharp objects of aircraft debris hampered divers trying to reach the black boxes in the sea.
"The current condition and waves are favorable ... but the black boxes were buried under tons of sharp objects of the wreckage," Margono told reporters Monday, adding that removing those obstacles had slowed efforts to reach the devices.
