KRI Nanggala (402)

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KRI Nanggala underway in the Java Sea, August 2015
History
Indonesia
Name	KRI Nanggala
Namesake	Divine spear of Prabhu Baladewa
Ordered	2 April 1977
Builder	Howaldtswerke-Deutsche Werft
Laid down	14 March 1978
Launched	10 September 1980
Completed	6 July 1981
Commissioned	21 October 1981
Out of service	21 April 2021
Identification	Pennant number 402
Fate	Imploded during torpedo drill, 21 April 2021 (with all hands)
Badge
General characteristics
Class and type	Cakra-class attack submarine
Displacement	1,285 tons surfaced 1,390 tons submerged
Length	59.5 m (195 ft 3 in)
Beam	6.2 m (20 ft 4 in)
Draft	5.4 m (17 ft 9 in)
Propulsion	4 × MTU 12V493 AZ80 GA31L diesel engines rated at 1.8 MW (2,400 hp)[1] 4 × Siemens alternators rated at 2,300 hp (1.7 MW) 1 × Siemens motor rated at 3.4 MW (4,600 hp) 1 × shaft
Speed	11 knots (20 km/h; 13 mph) surfaced[1] 25 knots (46 km/h; 29 mph) submerged
Range	8,200 nmi (15,200 km; 9,400 mi) at 8 kn (15 km/h; 9.2 mph)
Endurance	50 days[1]
Test depth	240 m (790 ft)[1]
Complement	50 including special forces unit[2]
Crew	6 officers, 28 enlisted[3]
Sensors and processing systems	Signaal Sinbad weapons control system[1] Thomson-CSF Calypso, I-band surface search radar Atlas Elektronik CSU 3-2 active/passive search and attack sonar PRS-3/4 passive ranging sonar
Electronic warfare & decoys	ESM : Thomson-CSF DR2000U[1] CMS : Kongsberg MSI-90U Mk 2[4]
Armament	8 × 533 mm (21 in) bow tubes[1] 14 × AEG SUT torpedoes

KRI Nanggala (402), also known as Nanggala II, was one of two Cakra-class Type 209/1300 diesel-electric attack submarines of the Indonesian Navy. It sank following an implosion in April 2021.

Ordered in 1977, Nanggala was launched in 1980 and commissioned in 1981. It conducted intelligence gathering operations in the Indian Ocean and around East Timor and North Kalimantan. It was a participant of the international Cooperation Afloat Readiness and Training naval exercise and conducted a passing exercise with USS Oklahoma City. The vessel underwent major refits by Daewoo Shipbuilding & Marine Engineering (DSME) in 2012 and Indonesian state-owned shipyard PT PAL in 2020.

On 21 April 2021, the ship went missing during a routine exercise in the Bali Sea. It was commanded by Colonel Harry Setyawan, and had 49 crewmembers and 3 weapon specialists on board. The Indonesian Navy, assisted by other countries, conducted a search, and three days later debris was discovered 19 kilometres (12 mi) from the point of last contact, and Nanggala was declared sunk. There were no survivors; all 53 people on board the ship died. On 26 April, the Indonesian government awarded posthumous promotions to everyone aboard the ship.

The cause of the sinking is presumed to be a power outage. Nanggala had experienced outages before but recovered successfully. Lt. Col. Heri Oktavian, who was killed in the incident, had previously voiced his frustrations about the maintenance of the ship; he claimed that the workmanship quality and maintenance services performed by state-owned naval dockyard PT PAL were unsatisfactory.