THE KRI Nanggala-402 submarine is assumed to have sunk in waters north of Bali due to various factors. One of them being faulty components due to age. Speaking over the phone on Friday, April 30, Assistant for Planning and Budgeting to the Indonesian Military (TNI) Navy Chief of Staff, Rear Adm. Muhammad Ali, said the ship was declared fit to operate until September 2022. He also stated that the Navy routinely maintains the German-made subma