Indonesian divers on Monday searched for the data recorders of a Sriwijaya Air jet that plunged into the sea two days ago with 62 people on board minutes after take off from Jakarta’s main airport.

The Boeing 737-500 jet was headed on a domestic flight to Pontianak on Borneo island, about 740 km from Jakarta, on Saturday before it disappeared from radar screens four minutes after take-off and crashed into the Java sea.

Authorities pinpointed the area where the data recorders, known as black boxes, are located on Sunday as they lifted chunks of the jet’s fuselage off the sea bed. Rescuers have also found human body parts and their personal effects.

Around 20 additional ships would be deployed, taking the total number of rescue vessels to 53, search and rescue operation director Rasman MS told a briefing at a Jakarta sea port.Flight SJ 182 had 12 crew and 50 passengers on board, all Indonesians and including 10 children.