Indonesia wants to expand its submarines fleet.

According to information published by Asian News International on June 2, 2021, Indonesia wishes to expand its submarine fleet to respond to Chinese incursions into its territorial waters, after Cakra-class KRI Nanggala missing.
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Nagapasa-class KRI Alugoro submarine (Picture source: SINDOnews)

Indonesia is examining agreements with France, Russia, and Turkey about the construction of new submarines, and already have a strategic partnership with the South-Korean company, Daewoo Shipbuilding, and Marine Engineering through the Nagapasa-class submarine.

The Nagapasa class is an upgraded variant of the Jang Bogo class, also known as Improved Chang Bogo. The vessels were built by the South Korean Daewoo Shipbuilding & Marine Engineering (DMSE) and the Indonesian PT PAL.

As of 2021, six ships have been planned, which were divided into two batches. Batch 1 consists of three ships and all are already commissioned. Batch 2 also consists of three ships that are in the early development stage.

The diesel-electric Nagapasa-class has a length of 61.3 metres (201 ft) with a beam of 6.3 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 has a maximum operating range of 10,000 nautical miles (19,000 km) and is powered by 4 MTU 12V 493 diesel generators.

Nagapasa-class is equipped with Black Shark torpedoes manufactured by Italian Whitehead Sistemi Subacquei, which has a speed of 50 knots (93 km/h; 58 mph) and a range of 50 kilometres (31 mi).