The black box recorder from a Lion Air crash which killed all 189 people on board has finally been recovered.

The cockpit voice recorder was pulled from the Java sea Monday (January 14), more than two months on.

Indonesian authorities said they will immediately dry it - and begin to download its contents.

It's thought that it could take up to three months to extract and analyze everything though.

The Boeing Co 737 MAX jet crashed on October 29 last year.

Contact with the flight was lost just 13 minutes after it took off from the capital Jakarta.

A preliminary report focused on airline training, the response of a Boeing anti-stall system, and a recently replaced sensor did not give a cause for the crash.

A group of victims' relatives are now urging Indonesian safety officials to reveal "everything that was recorded" and to work independently.

A navy spokesperson told Reuters a weak signal from the recorder was detected several days ago.

It was then found buried deep in soft mud on the sea floor in water about 30 meters deep.

It's unclear what damage there is to the box, although pictures show a number of scratches on the surface.

With the recovery, officials said there was no plan to continue searching for other parts of the wrecked plane.

Since the crash, Lion Air has faced scrutiny over its maintenance and training standards and relatives of victims have filed at least three lawsuits against Boeing.