Indonesia's navy is searching for a missing submarine with 53 people on board.
The submarine was conducting a torpedo drill north of Bali but failed to communicate the results of the drill. Contact with the vessel was lost early Wednesday morning.
Foreign Minister Marise Payne says Australia will provide whatever support it can to Indonesia.
"We are obviously very concerned about these reports. It's very distressing for families and particularly for the Indonesian Navy," says Payne.
"We've indicated that we will help in any way we can. We operate very different submarines from this one, but the Australian Defence Force and Australian Defence organisation will work with defence operations in Indonesia to determine what we may be able to do.