This photo shows the Indonesian submarine that went missing off Bali on April 21, 2021. (Photo: EPA-Yonhap News)
Rescuers in Indonesia are in a desperate race against time to find 53 sailors trapped inside a missing submarine.
The vessel's supply of oxygen is expected to run out at 3 a.m. on Saturday, perhaps earlier.
The BBC's Michael Bristow reports.
In a televised address, the Indonesian President Joko Widodo asked the nation to pray for the crew.
He said the authorities were doing their best to find them.
The Navy submarine went missing on Wednesday while taking part in a torpedo drill off the island of Bali.
Search teams are concentrating on an object that's described as having high magnetism.
There's concern the submarine could've sunk to depths to below what it could withstand.
Other nations are sending ships to help.
But most of them are expected to arrive after the oxygen is run out.
Earlier, South Korea expressed its intent to help with the search mission.
Defense Minister Suh Wook said they are ready to assist at any time.
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