Indonesia’s Rigel warship scanned the area with sonar, which uses sound waves to locate objects, and a magnetometer, Tjahjanto told a news conference. The MV Swift Rescue ship from Singapore then sent a remote operated vehicle (ROV) to get clearer underwater visual imagery, he said.
“We found and confirmed an image of Nanggala submarine parts, like horizontal steering, anchor, exterior body, vertical steering, and other submarine parts like safety suits for crew,” he said.
“Based on that authentic proof I declare here that the Nanggala submarine sank and all of the crew died.”
The submarine was found at a depth of 850 meters (930 yards) and had broken into three parts, Indonesian Navy Chief of Staff Yudo Margono said.
Tjahjanto extended his deepest condolences to the families of the crew, known as the Golden Shark unit, and said all those on board would be given honors and an increase in rank.
The Indonesian government will work with the International Submarine Escape and Rescue Liaison Office, he said, “because to evacuate the Nanggala submarine we need international cooperation.”
Hopes of finding any of the crew alive had already dimmed Saturday, when debris including a bottle of grease, part of a torpedo launcher, part of a metal tube, prayer mats and fuel were found floating at a location where the sea is 850 meters (930 yards) deep.
Authorities said earlier the submarine could not survive at depths beyond 500 meters. The crew were also expected to have run out of oxygen early on Saturday.
The German-made submarine lost contact during a military exercise in the Bali Strait early on Wednesday morning.