The Indonesian submarine that went missing on Wednesday off the coast of Bali with 53 people on board has reportedly sunk.
Rescuers found debris including prayer mats, where the submarine went missing.
The Indonesian navy has insisted the sub was in good condition but an oil slick where it is thought the vessel submerged has raised concern that the fuel tank may have been damaged.
“We have found several pieces and parts that are believed to be parts or components that are attached to the submarine that would not come out of the ship if there had not been pressure from outside or a crack in the torpedo launcher,” said Navy Chief of Staff Yudo Margono.
Among the items recovered was a bottle of grease for lubricating the periscope. They were found in a 16km radius where no other ships had passed.
A scan detected the sub at a depth of 850 meters, well beyond its survivable limit.
It was only carrying enough oxygen for three days.
The KRI Nanggala-402 was conducting live-fire torpedo exercises north of the island of Bali when it lost contact at about 3:00am on Wednesday morning.
The submarine got lost after it had been given clearance to dive into deeper waters.
The German-made submarine is one of five submarines operated by Indonesia.
It was made in the late 1970s, and underwent a two-year refit in South Korea that was completed in 2012. It is the first time Indonesia has lost one of its submarines, a Navy spokesman said.
Similar incidents have happened elsewhere. In 2017, an Argentine military submarine went missing in the southern Atlantic with 44 crew on board.
Its wreck was located a year later, and officials confirmed that the submarine had imploded.