Jakarta:The Indonesian Army detected underwater movement at 2.5 knots around the last location of the submarine Nanggala-402 missing during a torpedo firing exercise in waters north of Bali Island, according to an official source on Thursday.
"The contact then lost, so there is still not enough data to identify that it was a submarine," said the military spokesperson Achmad Riad.
Read:|Indonesian military says submarine missing with 53 onboard
A helicopter and two military vessels also found the oil spill and the smell of diesel fuel at several different locations, but it is not yet possible to conclude that this is submarine fuel, Riad added.
Besides, the Singapore Swift Rescue vessel is expected to arrive in Bali waters on Saturday to assist the search and rescue operation, while the Rescue Mega Bakti Malaysia ship will arrive on April 26.
Offers of assistance also came from the US, Germany, France, Turkey, India, Russia, and Australia, added Riad.