Nanggala underwent a refit at Howaldtswerke that was completed in 1989.[19] Roughly two decades later, the boat underwent a full refit for two years in South Korea by Daewoo Shipbuilding & Marine Engineering (DSME) that was completed in January 2012.[20][21][lower-alpha 1] The refit cost US$ 63.7 million,[23] replaced much of the submarine's upper structure, and upgraded its weaponry, sonar, radar, combat control, battery,[failed verification] and propulsion systems.[24][21] After the refit, Nanggala became capable of firing four torpedoes simultaneously at four different targets and launching anti-ship missiles such as the Exocet or the Harpoon.