Banyuwangi: Indonesia’s navy on Saturday declared its missing submarine had sunk and cracked open, killing 53 crew members aboard, after finding items from the vessel over the past two days. Military chief Hadi Tjahjanto said the presence of an oil slick as well as the discovery of debris near the location of KRI Nanggala 402's last dive on Wednesday off the island of Bali were clear proof the vessel had sunk.
Navy Chief Yudo Margono said, "If it's an explosion, it will be in pieces. The cracks happened gradually in some parts when it went down from 300 metres to 400 metres to 500 metres...If there was an explosion, it would be heard by the sonar." The navy previously said it believes the submarine sank to a depth of 600-700 metres (2,000-2,300 feet), much deeper than its collapse depth of 200 metres (655 feet), at which point water pressure would be greater than the hull could withstand.
The cause of the disappearance was still uncertain. The navy had previously said an electrical failure could have left the submarine unable to execute emergency procedures to resurface.