Indonesia's first domestic submarine undergoing sea trials.

Indonesian state-owned shipbuilder PT PAL launched the first diesel-electric submarine built in Indonesia on April 11, 2019, in Surabaya. The Alugoro (405) is the third of the Nagapasa-class submarine (also known as the DSME 1400 design or Improved Chang Bogo-class) for the Indonesian Navy.

The Alugoro (405) is the third of the Nagapasa-class submarine (Picture source: DSME picture)

Alugoro (405) is a submarine of the Indonesian Navy. She is part of the improved Chang Bogo class, also known as the Nagapasa class. The vessel was assembled by PT PAL and was launched in April 2019, with plans for it to be commissioned sometime in 2019. She is the first submarine to be assembled in Indonesia.

The diesel-electric Alugoro has a length of 61.2 metres (201 ft) with a beam of 6.25 metres (20.5 ft) and a hull draught of 5.5 metres (18 ft). She has a peak speed of 21.5 knots (39.8 km/h) when submerged and 11 knots (20 km/h) surfaced. The vessel is powered by 4 MTU 12V 493 diesel generators.

Submarines of the Nagapasa class also possess ZOKA acoustic torpedo countermeasures manufactured by Turkish company Aselsan.

The ship was ordered on 21 December 2011 as part of a US$ 1.07 billion contract between Indonesia and South Korea to provide three submarines, with Daewoo Shipbuilding & Marine Engineering being awarded the contract. As part of the deal, two of the submarines (Nagapasa and Ardadedali) were constructed in South Korea, while the third one was constructed in PT PAL's shipyard in Surabaya as part of a technology transfer program. Alugoro was the first submarine to be assembled and launched in Indonesia and Southeast Asia.

She was launched at PT PAL's dockyard in Semarang on 11 April 2019 and is scheduled to be commissioned sometime in 2019. The name Alugoro - originating from a weapon name in wayang tradition - was previously assigned to a Whiskey-class submarine built by the Soviet Union which was used during the 1962 Operation Trikora.