The nanggala submarine sank to a depth of about 700 meters, making the submarine rescue devices now not reach.

The Indonesian Navy said the missing Kri Nanggala submarine while operating in the sea is about 96 km from Bali Island and is more likely to sink at a depth of 600-700 m.

"Most submarine rescue systems can only operate at a depth of about 600 meters. They can reach deeper, due to safety amplitude in design, but devices such as pumps or systems

The Indonesian Navy is implementing 5 naval vessels and a helicopter to the scene, while an ocean surveyer is also on the move.

Kri Nanggala submarine gathers off the city of Cilegon in October 2017.

Bobby Adhityo Rizaldi, a member of the Board of Directors of Indonesian People's Council, acknowledges the navy this country is not currently equipped with dedicated vehicles to rescue submarines and must be due to support from other countries.

Singapore and Malaysia sent a rescue ship to help Indonesia, but these vessels are likely to take 2-3 days to reach the scene.

However, many experts who receive a depth of 700 meters under the seabed threaten the sustainability of the ship structure, which can cause traditional submarines such as Kri Nanggala crushed.

Ahn Guk-hyeon, a leader of the DAEWOO MARINE AND DAEWOO MECHANICAL COMPANY, the unit has renovated the Kri Nanggala submarine in the period of 2009-2012, said most submarines cannot stand the pressure

Mr. Ahn said his company has upgraded many structures and systems inside the nanggala submarine, but does not know the status of the ship today, due to not involved in any work on that submarine

The cycling of Nanggala brought the number of 402 loss of contact when participating in April 21 in the offshore area of Bali.

The Indonesian Navy said Nanggala submarine could have a power outage while diving, making the battleship lose control and could not perform the emergency processes to speak again.

Indonesia owns a 5-piece submarine fleet, in which two cakra classes made by Germany are Nanggala and Kri Cakra, three other Nagapasa classes manufactured by Korea, Kri Nagapasa, Kri Ardadedali and Kri Alugoro.