The search for the missing Indonesian submarine with 53 crew aboard has passed a grim milestone, with official estimates predicting the vessel would have run out of oxygen early this morning.
Indonesia’s naval chief warned yesterday that oxygen supplies for the KRI Nanggala-402 would run out by on Saturday at 3am (6am AEST), the Straits Times reported.
Two Australian warships, HMAS Ballarat and HMAS Sirius have both been dispatched to help, after Indonesia accepted the Federal Government’s offer of assistance.

Both warships were diverted from separate deployments to the search zone off the coast of Bali.

HMAS Ballarat, front, is being sent to help find the missing Indonesian submarine. (Royal Australian Navy) (Supplied)

The Defence Department said HMAS Ballarat was equipped with sonar capabilities and a MH-60R helicopter. It was expected to arrive at the search area yesterday.

HMAS Sirius is currently off the coast of Brunei and is expected to reach the search area early next week.

Fleet commander Rear Admiral Mark Hammond said the two Australian ships would help expand the search area.

“My thoughts are with the submariners of KRI Nanggala, their families and the Indonesian people,” Rear Admiral Hammond said.

“As always, we stand ready to assist our fellow mariners in the Indonesian Navy.”

The Indonesian submarine went missing on Wednesday with 53 sailors on board.

The submarine went missing about 95km north of Bali. (Nine)

“We lost contact (with the vessel) yesterday at 3am, so it can last until Saturday 3am,” naval chief of staff Yudo Margono said.

The US and Singapore militaries are also joining the search operation.

Australian Strategic Policy Institute senior analyst Marcus Hellyer said earlier this week that things were looking “very grim” for the submarine crew.

“There’s lots of things that can go wrong on submarines,” Dr Hellyer told

“If a submarine has an accident at sea, it tends to be catastrophically bad.”

Indonesian Navy submarine KRI Nanggala sails in the waters off Tuban, East Java in 2014. (AP)

An oil slick has been spotted in the spot where the submarine dived from the surface, but aside from that, there is no trace of the KRI Nanggala-402.

And most submarines, including the KRI Nanggala-402, are not designed to survive more than a few hundred metres underwater.

This content first appear on 9news

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