Indonesia’s navy is searching for a submarine with 53 people on board that lost contact on Wednesday and is seeking help from Australia and Singapore in the hunt.

The 43-year-old submarine, KRI Nanggala-402, was conducting a torpedo drill in waters north of the island of Bali but failed to relay the results as expected, a navy spokesman said. “We are still searching in the waters of Bali, 96km from Bali, (for) 53 people,” military chief Hadi Tjahjanto said.

The military chief confirmed that assistance in the search had been sought from Australia and Singapore.