AirAsia Flight 8501: Plane's Tail Lifted From Sea But No Black Boxes Found

Ping-like sounds have been heard from the seabed.

The black boxes, which feature cockpit voice and flight data recordings, may have dislodged from the plane's tail when it crashed into the sea on Dec. 28, Indonesian military commander Gen. Moeldoko told The Associated Press.

While the black boxes remain missing, ping-like sounds have been detected from the seabed, said Moeldoko.

"I am fully confident that the black boxes are still not far from the tail," he told The AP.

The discovery of the plane's tail earlier this week was a major breakthrough in the slow-moving search that has been hampered by seasonal rains, choppy seas, and blinding silt from river runoff.

At this point, nearly 50 bodies have been recovered from the crash, which killed 162 people.

Get real-time updates as this story unfolds. To start, just "star" this story in ABC News' phone app. Download ABC News for iPhone here or ABC News for Android here. To be notified about our live weekend digital reports, tap here.

The Associated Press contributed to this report.