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KRI Nanggala (402)

Diesel-Electric Attack Submarine

Indonesia | 1981

"Tragically, KRI Nanggala 402 was lost with all hands aboard on April 21st, 2021 when contact was lost with the boat."

Authored By: Staff Writer | Last Edited: 04/29/2021 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
KRI Nanggala (402) was a Cakra-class diesel-electric attack submarine serving the Indonesian Navy. The boat was ordered on April 2nd, 1977 and built by Howaldtswerke-Deutsche Werft of Germany with her keel laid down on March 14th, 1976. The boat was launched on September 10th, 1980 and completed on July 6th, 1981. She was formally commissioned into service on October 21st, 1981 with pennant number 402. She was also known by the name "Nanggala II".

Tragically, the boat was lost with all hands (53 souls) on April 21st, 2021 while on exercise testing a torpedo launch.

KRI Nanggala represented one of the two ships built to the Cakra-class standard, these based in the German Type 209/300 series diesel-electric attack submarines (hence their construction in a German shipyard). The pair were built between 1977 and 1981 and entered commissioned service in 1981.

As completed, the boat displaced 1,285 tons when surfaced and 1,390 tons when submerged. Her dimensions included a running length of 195.2 feet with a beam of 20.3 feet and a draught down to 17.8 feet. Power was from 4 x MTU 12V493 AZ80 GA31L series marine diesels developing 2,400 horsepower coupled with 4 x Siemens alternators generating 2,300 horsepower as well as 1 x Siemens motor generating 4,600 horsepower. All told, this allowed the vessel a surfaced headway speed of 11 knots and this increasing to 25 knots for undersea travel. Range was out to 9,400 miles (8,200 nautical miles).

Aboard was a crew of about 50 personnel including six officers. Provision was had to also support Indonesian special forces operatives for clandestine missions.Onboard supplies and fuel allowed the vessel to remain at-sea for some 50 days before requiring resupply.

Primary systems included the Signaal Sinbad Weapons Control System (WCS), the Thomson-CSF Calypso I-band surface-search radar, the Atlas Elektronik CSU 3-2 active/passive search-and-attack sonar fit, and the PRS-3/4 passing ranging sonar unit. The boat also carried an Electronic Warfare (EW) arrangement made up of the Thomson-CSF DR2000U.

The weapon configuration was 8 x 533mm (21") torpedo tubes and 14 x AEG SUT torpedo reloads were carried. The tubes were bow-facing and represented the sole armament fit for the boat when originally commissioned - whose inherent role was attack. Only later was an anti-ship missile capability added.

Nanggala's career covered the usual naval exercises and joint operations seen in other services with mock attacks, undersea and surfaced travel patrols, and gathering intel. For a time, the boat - along with sister KRI Cakra - were the only submarines available to the service due to a U.S. military embargo on the country which restricted any additional submarine purchases. This lasted until 2017 with the arrival of KRI Nagapasa.

In 1989, the boat undertook a refit and a more thorough phase followed in 2012 by South Korean-based Daewoo Shipbuilding & Marine Engineering (DSME). In the latter, the vessel's upper sections were reworked and onboard systems - including deep sea performance and diving depths, engines, weapons (now supporting anti-ship missiles), and sonar - were enhanced/modernized.

The boat's fate was sealed on April 21, 2021 when contact with it was lost during exercises as the boat submerged to fire a torpedo. When the crew (53 were on board) failed to report the results, the Indonesian Navy began a search for the doomed vessel. It was located in three major pieces by sonar at 2,800 feet depth - its hull being rated only for about 1,600 feet.

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April 2021 - KRI Nanggala (402) was lost during a submerged torpedo firing exercise.

Power & Performance
Those special qualities that separate one sea-going vessel design from another. Performance specifications presented assume optimal operating conditions for KRI Nanggala (402).
4 x MTU 12V493 AZ80 GA31L diesel engines developing 2,400 horsepower with 4 x Siemens alternators generating 2,300 horsepower and 1 x Siemens motor generating 4,600 horsepower; 1 x Shaft astern.
11.0 kts
12.7 mph
Surface Speed
25.0 kts
28.8 mph
Submerged Speed
8,168 nm
9,400 miles | 15,128 km
The bow-to-stern, port-to-starboard physical qualities of KRI Nanggala (402).
195.2 ft
59.50 meters
O/A Length
20.3 ft
6.19 meters
17.8 ft
5.43 meters
Displacement (Submerged)
Available supported armament and special-mission equipment featured in the design of KRI Nanggala (402).
8x 533mm (21") bow-facing torpedo tubes with 14 x Torpedo reloads (AEG SUT family).

Ability to launch anti-ship missiles.
Ships-in-Class (2)
Notable series variants as part of the KRI Nanggala (402) family line as relating to the Cakra-class group.
KRI Cakra (401); KRI Nanggala (402)
Global operator(s) of the KRI Nanggala (402). Nations are displayed by flag, each linked to their respective national naval warfare listing.

Shipbuilder(s): Howaldtswerke-Deutsche Werft - West Germany
National flag of Indonesia

[ Indonesia ]
Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to seaborne requirements.
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Developments of similar form-and-function, or related, to the KRI Nanggala (402) Diesel-Electric Attack Submarine.
Going Further...
KRI Nanggala (402) Diesel-Electric Attack Submarine appears in the following collections:
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