A scan detected the submarine at 850 metres deep – well beyond its survivable limits.
Singapore’s MV Swift Rescue – a submarine rescue vessel – arrived to aid in the recovery effort, the navy said. Neighbouring Malaysia as well as the United States, India and Australia were among the nations helping in the search.
Items located from the stricken submarine included a bottle of lubricant and a device that protects a torpedo, Air Marshall Hadi Tjahjanto said.
“The objects found near the last location of the submarine are believed to be parts of the submarine,” he said. “These objects would have never got out of the submarine unless there was pressure.”
The submarine – one of five in Indonesia’s fleet – disappeared on Wednesday during live torpedo training exercises off the Indonesian holiday island of Bali.
Navy chief Yudo Margono said on Saturday that rescuers found several items, including parts of a torpedo straightener, a grease bottle believed to be used to oil the periscope, and prayer rugs from the submarine.
“With the authentic evidence we found believed to be from the submarine, we have now moved from the sub miss phase to sub sunk,” Margono said.
Indonesia earlier considered the submarine that disappeared off Bali as just missing. But now officials declared the submarine sank.
Authorities said it was unlikely that there was an explosion on board the submarine, Al Jazeera’s Jessica Washington reported from the Indonesian capital Jakarta.
“In that event [an explosion], they would have heard it by now at this stage,” she said, adding that authorities were still exploring the possibilities for medical evacuations.