BANYUWANGI, Indonesia (AP) — Indonesia’s military on Sunday officially said all 53 crew members from a submarine that sank and broke apart last week are dead, and that search teams had located the vessel’s wreckage on the ocean floor.

The grim announcement comes a day after Indonesia said the submarine was considered sunk, not merely missing, but did not explicitly say whether the crew was dead. Officials had also said the KRI Nanggala 402’s oxygen supply would have run out early Saturday, three days after vessel went missing off the resort island of Bali.

“We received underwater pictures that are confirmed as the parts of the submarine, including its rear vertical rudder, anchors, outer pressure body, embossed dive rudder and other ship parts,” military chief Hadi Tjahjanto told reporters in Bali on Sunday.

“With this authentic evidence, we can declare that KRI Nanggala 402 has sunk and all the crew members are dead,” Tjahjanto said.

An underwater robot equipped with cameras found the lost submarine was lying in at least three pieces on the ocean floor at a depth of 2,750 feet, said Adm. Yudo Margono, the navy’s chief of staff.

That’s much deeper than the KRI Nanggala 402′s collapse depth of 655 feet, at which point water pressure would be greater than the hull could withstand, according to earlier navy statements.

The wreckage is located 1,500 meters (yards) to the south of the site where the submarine last dove Wednesday, off Bali’s northern coast, Margono said.

The underwater robot was deployed by Singaporean vessel MV Swift Rescue provided the images, while the Indonesian vessel KRI Rigel had scanned the area where the submarine was believed to have sank using multibeam sonar and a magnetometer, Tjahjanto said.

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.

An American reconnaissance plane, a P-8 Poseidon, landed early Saturday and had been set to join the search, along with 20 Indonesian ships, a sonar-equipped Australian warship and four Indonesian aircraft.

The German-built diesel-powered KRI Nanggala 402 had been in service in Indonesia since 1981 and was carrying 49 crew members and three gunners as well as its commander, the Indonesian Defense Ministry said.

Indonesia, the world’s largest archipelago nation with more than 17,000 islands, has faced growing challenges to its maritime claims in recent years, including numerous incidents involving Chinese vessels near the Natuna islands.