The United States on Friday (23) sent search and rescue equipment to help find the missing submarine. KRI Nanggala-402, which has 53 people on board, and lost contact during training maneuvers in the north of the island of Bali, Indonesiaat 3 am (local time) on Wednesday (21).
As the reserves of oxygen of the submarine during a power outage is 72 hours, time is running out.
A CNN reported that it is possible for three C-17 aircraft to be shipped with vessels and underwater search and rescue equipment.
“We are deeply saddened by the news of the loss of the Indonesian submarine and our thoughts are with the Indonesian sailors and their families. At the invitation of the Indonesian government, we are sending airborne means to assist in the search for the missing submarine, ”wrote John Kirby, Pentagon press secretary, on Twitter, on Thursday (22).
Contact with the German submersible manufactured in 1977 and modernized in 2012 was lost after he received authorization to dive in deeper waters. "We know the area, but it is quite deep," Julius Widjojono, the first Indonesian navy admiral, told AFP news agency.
Ships war, helicopters and hundreds of people are involved in the search for help from Singapore, Malaysia, Australia, France and Germany.
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Australian Defense Minister Peter Dutton said the information increased "the fear of a terrible tragedy". "It is possible that a power outage occurred, which left the submarine out of control and prevented the launch of emergency measures, sinking at 600 or 700 meters," explained a spokesman for the Indonesian Navy.
"If he sank 700 meters, there is a good chance that he broke," French Vice Admiral Antoine Beausssant told the France Presse news agency.
But why is it so hard to find a missing submarine?
It is important to remember that military submarines are built with “stealth” technology to cross the oceans in the most undetectable way possible. They emit almost no noise or heat and reflect radar and sonar impulses as little as possible.
Aerodynamics are very important because the better the displacement of the submarine, the lower the noise and heat emission from the engine.
Currently, in military submarines practically only non-magnetic materials are used, such as stainless steel or titanium. This has to do with the fact that many underwater mines are equipped with magnetic detonators. If a ship's hull passes too close, they explode.
A suitable coating can absorb much of the sonar signal. Thus, on the screen, the submarine can appear only as a mound of scattered mud.
KRI Nanggala-402 has undergone two-year renovation
The KRI Nanggala-402 was manufactured in 1977, but underwent a complete overhaul for two years in South Korea. In February 2012 it was handed over to the Indonesian government with much of its upper structure replaced. Its armament, sonar, radar, combat control and propulsion systems have been updated.
The submarine now has a safe diving depth increased to 257 meters (843 feet) and a maximum speed increased from 21,5 knots (39,8 km / h) to 25 knots (46 km / h). The submersible also became capable of firing four torpedoes simultaneously at four different targets and launching anti-ship missiles.
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