Indonesian Navy submarine missing in Bali Sea 21 April 2021 by Ridzwan Rahmat An Indonesian Cakra (Type 209/1300)-class diesel-electric submarine (SSK) has been reported as missing and an attempt to rescue it is currently underway. KRI Nanggala , seen here in a file photo. The vessel was reported as missing in the Bali Sea on 21 April. (TNI-AL) The Indonesian government has yet to issue an official statement but Janes has confirmed with Indonesian Navy (Tentara Nasional Indonesia – Angkatan Laut: TNI-AL) sources that the missing boat is KRI Nanggala (402), which was deemed to be in distress after missing a scheduled reporting call with the TNI-AL at about 03:00 local time on 21 April.