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Indonesia submarine: Video emerges of crew singing farewell weeks before disaster

"I'm not ready to live without you, I wish all the best for you," the crew sang.

Video has emerged showing sailors on the doomed Indonesian submarine singing a farewell song weeks before it sank.

The Indonesian military released the video last month, but it caught the attention of many on social media in the last few days. It shows tightly crowded crew members in uniform as one strums a guitar. Together they sing an Indonesian song called "Sampai Jumpa," which means "see you later."

"Even though I'm not ready to be missing you, I'm not ready to live without you, I wish all the best for you," they sing in unison.

The short video was recorded weeks before the disaster as part of a submarine commander's farewell, according to the Indonesian military.

People throw flowers and petals with names of the sunken KRI Nanggala-402 submarine crew members during a prayer at sea near Labuhan Lalang, Indonesia, on Monday.Fikri Yusuf / Antara Foto / Reuters

The commander in charge at the time of the sinking, Heri Oktavian, can be seen in the middle of the group singing along with colleagues.

The submarine's 53 crew members were confirmed dead by Indonesia's military Sunday after wreckage was detected in at least three parts on the ocean floor.

"With this authentic evidence, we can declare that 'KRI Nanggala 402' has sunk and all the crew members are dead," Indonesian military chief Hadi Tjahjanto told reporters over the weekend. It is not known whether those in the video were on the vessel when it sank.

The German-built KRI Nanggala 402 had disappeared days earlier off the vacation island of Bali, in southeast Asia, sparking international search efforts. The United States sent a P-8 Poseidon reconnaissance plane to aid the desperate search in a race against time as oxygen supplies onboard depleted.

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Debris, including oil bottles and Islamic prayer rugs, was found floating in the ocean over the weekend. The submarine lost contact Wednesday when it missed a scheduled reporting call while the crew was rehearsing for torpedo drills.

The cause remains unclear. The navy had said an electrical failure could have left the submarine unable to execute emergency procedures to resurface.

The navy plans to eventually lift the wreckage and recover the dead, although the depth of the water poses a significant challenge, said Adm. Yudo Margono, the navy's chief of staff.

Parts of the missing submarine sit on the seafloor off Bali, Indonesia.Indonesia Military / AFP - Getty Images

An underwater robot and scanning technology detected the vessel on the ocean floor at a depth of 838 meters (2,750 feet), Margono said — where the water pressure would be far greater than the hull could withstand, according to earlier navy statements.

Indonesian President Joko Widodo delivered his condolences in a televised address Sunday, expressing his "deep sorrow," as family members mourned.

The submarine, which had been in service in Indonesia since 1981, was carrying 49 crew members and three gunners, as well as its commander, the Defense Ministry said.

The Associated Press contributed.