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The navy has said an electrical failure could have left the submarine unable to execute emergency procedures to resurface.

The cause of the disappearance is still uncertain. The vessel's collapse depth was estimated at 200 metres by a South Korean company that refitted the vessel between 20. However, the navy said it believes that the submarine sank to a depth of 600 to 700 metres, much deeper than its collapse depth, at which point water pressure would be greater than the hull could withstand.

Margono said an unidentified object exhibiting high magnetism had been located at a depth of 50 to 100 metres and officials were holding out hope that it is the submarine. In this aerial photo, the Indonesian navy submarine KRI Alugoro is shown Thursday during a search for the KRI Nanggala 402. He asked Indonesians to pray for the crew's safe return, while ordering all-out efforts to locate the submarine. Indonesian President Joko Widodo cancelled a visit to Banyuwangi port, where some rescue ships left earlier, to prepare for a weekend regional summit in Jakarta, officials said. Rescuers made similar massive searches in the previous two days. Twenty-four Indonesian ships and a patrol plane were mobilized for the search Friday, focusing on the area where an oil slick was found after the submarine disappeared during an exercise. The German-built, diesel-powered KRI Nanggala 402 has been in service in Indonesia since 1981 and was carrying 49 crew members and three gunners as well as its commander, the Indonesian Defence Ministry said. Singaporean and Malaysian rescue ships were also expected in the coming days. "These two Australian ships will help expand the search area and extend the duration of the search effort," Australian Navy Rear Adm. Students and teachers at a school in Surabaya pray on Friday for the 53 crew members aboard the Indonesian navy submarine.