Divers reported seeing the fuselage and engines of the crashed Lion Air jet on the seafloor and a ping locator has detected a signal that may be from the cockpit voice recorder, Indonesia's search and rescue chief said on Saturday.
"But we can't find the CVR yet", Syaugi said.
Rescuer Syachrul Anto, 48, collapsed on Friday after a diving mission to the seabed and later died from decompression sickness.
Anto was found unconscious by other members of the team and taken to a local hospital, where he was declared dead, reportedly due to complications from uncontrolled decompression.
Head of Basarnas Muhammad Syaugi told a press conference on Sunday that the agency has extended the search operation by three days as divers continue to search for more remains and the plane's main fuselage.
More than 60 body bags containing human remains have been sent to police medical experts for identification since the search began, but as of Thursday only one victim has been identified and buried.
Lion Air flight JT 610, with 188 people aboard, was traveling from Jakarta to Pangkal Pinang when it crashed into the Java Sea on Monday. According to him, shortly after takeoff from the airport of Jakarta from the airliner Lion Air has received an alarm signal, but then the pilot announced the problem and chose to continue their journey.
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Rescue workers lower parts found in the search.
A forensic investigator collects samples of recovered belongings believed to be from the crashed Lion Air flight JT610.
The investigation has been marred by strong currents.
While the force of the impact tore off exterior electronics and some of the recorder's structure, the module holding the data-storage area appears in news photos to be intact and the unit should still be operable, said James Cash, a former National Transportation Safety Board (NTSB) investigator who's processed thousands of such recorders.
The accident resurrected concerns about Indonesia's poor air safety record which until recently saw its carriers facing years-long bans from entering European Union and U.S. airspace.
In 2014, an AirAsia crash in the Java Sea during stormy weather killed 162 people. The agency lifted the ban in 2016.The European Union similarly barred Indonesian carriers from flying into European airspace from 2007 until June.
One day before a Lion Air plane crashed, the pilot flying it made a distress just call minutes after taking off.