The Indonesian Navy, with the assistance of other countries, began searching for the disappeared ship. On April 24, 2021, 3 days after the ship stopped communicating, wreckage from the ship was recovered 19 kilometers away, and the ship was certified lost.
KRI Nanggala (402), also known as Nanggala II, was among the Indonesian Navy's two Cakra-class Type 209/1300 diesel-electric assault submarines. Nanggala was ordered in 1977, constructed in 1980, and serviced in 1981. It carried out information collecting activities in the Indian Ocean, as well as in the vicinity of East Timor and North Kalimantan. It took part in the multinational Cooperation Afloat Readiness and Training naval operation and passed through alongside the USS Oklahoma City. Daewoo Shipbuilding & Marine Engineering (DSME) completed a significant overhaul of the vessel in 2012, followed by PT PAL, an Indonesian state-owned shipyard, in 2020.
During a normal practice in the Bali Sea, the ship mysteriously disappeared. Colonel Harry Setyawan led the ship during the drill, which had 49 members of the crew and three armament experts on board. The Indonesian Navy, with the assistance of other countries, began searching for the vanished ship. Three days after the ship's final communication, wreckage from the ship was recovered 19 kilometers away, and the ship was proclaimed sunk. There were no rescues; all 53 individuals on board died. Everybody onboard the ship received posthumous awards from the Indonesian government.
