Indonesia submarine with 53 on board goes missing north of Bali | Indonesia News | Al Jazeera
https://www.aljazeera.com/news/2021/4/21/indonesia-searching-for-missing-submarine-with-53-on-boardIndonesian navy submarine found split into three on sea bed - BBC News
https://www.bbc.com/news/world-asia-56879933Indonesian submarine: 53 sailors presumed dead as navy says vessel sunk
https://www.nbcnews.com/news/world/indonesian-submarine-53-sailors-presumed-dead-navy-says-vessel-sunk-n1265179KRI Nanggala (402) - Wikipedia
https://en.wikipedia.org/wiki/KRI_Nanggala_(402)Search for missing Indonesian submarine finds oil spill | Reuters
https://www.reuters.com/world/asia-pacific/indonesian-navy-checking-submarine-after-failure-report-back-exercise-2021-04-21/Sunken missing Indonesian submarine found cracked open by rescuers | Reuters
https://www.reuters.com/article/us-indonesia-submarine/sunken-missing-indonesian-submarine-found-cracked-open-by-rescuers-idUSKBN2CC09M