The Indonesian Navy deployed 7 ships and many aircraft to find Kri Nanggala submarines, neighboring Singapore also conducted ships to support.

Force was deployed by the Indonesian Navy to seek the missing Kri Nanggala submarine including hydrological exploration ship Kri Rigel, Fatahillah lightweight guards, Tomo Bung Tom and underground guards Teuku Umar.

Kri Nanggala submarine (left) in a 2017 rehearsal. Photo: Indonesian Navy.

"Navy forces are looking for missing submarines. We know this waters, but it is quite deep," said Major General Julius Widjojono, head of Indonesian Naval Information Agency, said.

The Indonesian army also gave an emergency signal to the International Submarine Rescue Office (Ismerlo) and received response from the Singapore Navy, Australia, India, pledging to support the ship's search campaign

After receiving the recommendation of support from Indonesia, Singapore, the ship rescues the MV Swift Rescue submarine to search support under the agreement between the two countries.

Kri Nanggala submarine carrying 53 Last contacters with the Commander at 3:00 am on April 21 to ask for a diving to dive into the sea to conduct the Torpedo exercise on the Straite Bali located between Java and Bali.

The Indonesian Navy said it was likely that a total power failure occurred when diving, causing the loss of control submarines and the crew could not deploy an emergency process.

Nanggala submarine missing off Bali island.

The search process Kri Nanggala walks on Monday after the rescue force detects the oil streak in the area near the diving submarine.

Kri Nanggala is missing when rehearsing torpedoes in the northern waters of Bali island on April 21.