Chinese navy ships have arrived off Bali to help haul up a submarine that sank last month killing 53 crew, the Indonesian Navy said Tuesday as it geared up for a deep-sea salvage operation.

The help arrived after other foreign ships from Australia, Singapore and Malaysia left the archipelago, having assisted Indonesian authorities in finding the stricken vessel.

The KRI Nanggala 402 -- one of five submarines in Indonesia's fleet -- disappeared last month while it was scheduled to take part in live torpedo training exercises.

An underwater rescue vehicle supplied by neighbouring Singapore gave visual confirmation that the German-built sub was lying on the sea floor more than 800 metres (2,600 feet) deep, broken in three parts, confirming there was no hope of finding survivors.

Two Chinese salvage ships were on standby in waters off Bali, while a third was expected to arrive later Tuesday, the Indonesian Navy said, adding that Chinese Navy officials in Bali were helping to examine data collected on the submarine.

All three salvage ships can dive up to 4,500 metres deep.

Indonesia's Navy said Beijing's ambassador to the country had offered the help to Defence Minister Prabowo Subianto.

"The offer was welcomed by the Indonesian government," it said in a statement Tuesday.

A vessel from Indonesia's upstream oil and gas regulator task force SKK Migas, used for drilling operations, will also join the salvage operations. It has a crane with a capacity of 1,200 metric tons.

Last week the Navy said high-powered magnets and air balloons were among the possible options to lift the submarine. An undersea robot will also be used in the operation, it said.

The military has yet to offer an official explanation for the sinking of the decades-old submarine, which was delivered to the Southeast Asian nation in 1981.

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Indonesia says missing submarine found, all 53 crew killed
Bali, Indonesia (AFP) April 25, 2021
All 53 crew aboard an Indonesian submarine that disappeared last week were killed, the military said Sunday as it confirmed the vessel had been found in pieces on the seafloor. Authorities said that they picked up signals early Sunday from a location more than 800 metres (2,600 feet) deep - far below what the KRI Nanggala 402's steel hull was built to withstand. They had used an underwater submarine rescue vehicle supplied by neighbouring Singapore to get visual confirmation of the stricken ves ... read more