KRI Nanggala-402 submarine went missing north of Bali on Wednesday with 53 people on board.
The Indonesian Military (TNI) cautioned against unverified information amid an ongoing search.
TNI spokesman Major General Achmad Riad said at a press conference that contact was lost with the German-made submarine as it was conducting a torpedo drill in the waters about 60 miles (95 kilometers) north of Bali.
Achmad said the last communication with KRI Nanggala was at 4:25 am when the drill commander was authorizing a torpedo launch, that’s when communication with Nanggala was cut off.
Various reports, some of which based on statements from officials, have since emerged following the incident, including the possibility of electrical failure during the dive and damage to the fuel tank due to water pressure.
Amid the surge of potential explanations, Achmad said that the military is still waiting for developments and have yet to receive enough information that can be verified.
The submarine was carrying 49 crew members, its commander, and three arsenal personnel.
KRI Nanggala-402 is one of five submarines owned by TNI, and was built in West Germany in 1977.
The military has also sought assistance for the search from Australia and Singapore.
