Indigenous Submarine Construction Program

Indonesia is building indigenous submarine construction capability through a structured technology transfer program with South Korea's DSME (now Hanwha Ocean). The Nagapasa-class program delivered three Type 209/1400 diesel-electric submarines, with the third — KRI Alugoro (405) — assembled entirely at PT PAL's Surabaya shipyard, marking Indonesia's first domestically assembled submarine. A second batch of three improved boats is planned, with construction beginning in 2025 and completion targeted for 2033.

The strategic context is Indonesia's vast archipelagic geography — over 17,000 islands spanning 5,100 km — which makes submarine warfare capability existential for territorial defense. The South China Sea tensions and increasing Chinese naval presence have accelerated procurement timelines. Indonesia's submarine fleet is small (currently 5 boats including legacy German Type 209s) compared to neighbors like Vietnam (6 Russian Kilo-class) and Singapore (4 Invincible-class from Germany).

The long-term significance lies in defense industrial sovereignty. PT PAL's progression from knock-down assembly to full indigenous construction mirrors South Korea's own submarine development path with HDW/TKMS decades earlier. If Indonesia can master submarine construction, it becomes a potential exporter to other ASEAN navies — a geopolitical shift that would reduce regional dependence on European and Korean defense suppliers.