The second black box from last month’s downed AirAsia flight has been recovered.

The cockpit voice recorder box was lodged under heavy wreckage about a-hundred feet underwater. The device is now on its way to Jakarta, where it will be dried and analyzed by investigators trying to find out what exactly happened to the plane. So far, of the 162 passengers on board, 48 bodies have been recovered. Officials say the voice recorder could be crucial to the investigation since it records all conversations between pilots and air traffic control, as well as any noises in the cockpit, like possible alarms or explosions. Analyzing all the data on both black boxes could take up to two weeks.