The navy stated that Nanggala may have experienced a power outage.[32] After the finding of debris from Nanggala, Yudo Margono stated that the submarine may have cracked instead of exploded, as an explosion would have been detected by sonar.[68]
Indonesian People's Representative Council member and retired major general of the Indonesian Army Tubagus Hasanuddin suspected that the refit, performed by a South Korean firm in 2012, may not have been performed properly. He stated that after the refit, the submarine had failed a torpedo firing test, which resulted in three deaths. Hasanuddin also stated that Nanggala had exceeded its design capacity of 38 with 53 people on board when it sank. Yudo Margono said the boat was combat ready, had received a letter of acceptance, and had a history of successful firing exercises.[69]
https://en.m.wikipedia.org/wiki/KRI_Nanggala_(402)#cite_note-:10-73
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