Navy divers recovered the flight data recorder from a downed Indonesian jet on Tuesday with authorities hoping it will help explain what sent the plane with 62 people aboard into the Java Sea shortly after takeoff.

Divers brought the flight data recorder, known as one of the black boxes, from the ocean floor where it was buried in seabed mud under other debris from Sriwijaya Air Flight 182, The Associated Press reported that navy Chief Adm. Yudo Margono said. Tuesday’s recovery operation involved at least 160 divers.

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Military chief Air Chief Marshal Hadi Tjahjanto said the other black box, the cockpit voice recorder, was expected to be recovered soon because its signal came from the same area. The black boxes were located on Sunday using emergency signals that a navy ship’s sonar received that aligned with the last contact pilots made before the flight’s disappearance.

The search has utilized more than 3,6000 rescue personnel, 13 helicopters, 54 large ships and 20 small ships to find parts of the plane and human remains at about 75 feet below the surface, officials said.

At least 74 body bags including human remains have been sent to identification experts, and at least four victims have been identified, according to the AP.

Read more at The Hill.