“If the weather is good, the ship will start to depart today,” National Transporation Safety Commission (KNKT) Chief Soerjanto Tjahjono told Reuters on Tuesday.

The crash, the world’s first of a Boeing Co 737 Max jet and the deadliest of 2018, killed all 189 people on board. Investigators last week said they planned to use a navy ship for a fresh search for the crashed jet’s second “black box” after a 10-day effort funded by Lion Air failed to find the cockpit voice recorder (CVR).

A KNKT source, speaking on condition of anonymity, told Reuters the team will have seven days using the ship KRI Spica to find the CVR, which could hold vital clues giving investigators insight into the actions of the doomed jet’s pilots. Tjahjono declined to comment on whether there was a time limit on the search.

Contact with flight JT610 was lost 13 minutes after it took off on Oct 29 from the capital Jakarta heading north to the tin-mining town of Pangkal Pinang.

The other black box, the flight data recorder, was recovered three days after the crash.

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