Specifically, the divers found the recorder under 26 feet of mud, in approximately 100 feet of water by using a 'ping locator'.
The plane was flying from Jakarta to an Indonesian tin-mining region, when it lost contact with air traffic control, around 13 minutes after take off.
Moreover, according to data Lion Air Flight JT 610 called air traffic control and requested permission to return to the airport.
Yet, the plane did not turn around, and the air traffic control lost contact.
Indonesia's Transport Safety Commission published a report along with flight data record, which was found three days after the crash, according to which maintenance, training, the response of the plane's anti-stall system and a recently replaced sensor.
However, they couldn't understand the cause of the crash of the new Boeing 737.
Those taking part in the search mission hope to find helpful information in the voice recorder.
The Navy was called to help after the 10 days search by Lion Air that had no result. The L3 technologies Inc voice recorder is able to send acoustic pings for 90 days.
Also, Edward Sirait, Lion Air CEO, addressed to local media that the aircraft's crew hd reported unspecified problems one day prior to the flight. Therefore, the issue ws examined by crew, it was repaired and ready for flight,
Finally, a pre-flight checklist showed no issues, and Sirait said that the plane was ready to fly.