Indonesia Expands Submarine Fleet in Response to China’s Aggression in South China Sea Indonesian military sources have revealed that the country is planning to expand its submarine fleet from four vessels to 12, in response to China’s repeated incursions into disputed waters in the South China Sea. Indonesia has the world’s third largest water territory under its exclusive economic zone (EEZ), but currently has just four submarines. By contrast, Japan ranks sixth in water territory and has 20 submarines. Indonesia originally had five submarines, but lost one—KRI Nanggala-402—during an accident off Bali on April 21. A search and rescue team found that the submarine had sunk to the bottom of the sea and broken into three pieces, killing all 53 crew members. The German-made Nanggala-402 had been in service for 40 years.