Launching ceremony of the ROKN (Source : Republic of Korea)

South Korea has won $1.02 billion to supply Indonesia with three 1,400-ton submarines, according to multiple press reports.

The deal was signed between South Korean company Daewoo Shipbuilding and Marine Engineering and the Indonesian government, Newsis reported Friday.

Seoul's Defense Acquisition Program Administration (DAPA) took part in the signing ceremony in Bandung, Indonesia.

The 1,400-ton submarine is expected to be an upgraded version of the 1,200-ton Type 209 diesel-electric attack submarine in use in the South Korean navy, according to the report.

The submarine will accommodate 40 crewmembers and include eight launchers capable of shooting torpedoes, mines and missiles.

They will be delivered to Indonesia by the first half of 2026 and a product of joint construction at PT PAL Indonesia, a shipyard.

In 2011, Seoul supplied Jakarta with submarines.