More than twenty ships, helicopters and submarines for the Indonesian Navy, with the help of the sonar system, sweep the waters of northern Bali for Find the lost submarine Wednesday, with 53 crew members on board and the rest Less than 24 hours Oxygen capacity.
They will join the search and rescue operation on Friday Warship An Australian equipped with a sonar device and another helicopter. A second Australian warship is expected, as well as rescue ships from Singapore and Malaysia, in the coming days.
The BBC reported on Friday that the US military is sending Air assistance.
Indonesian Air Force plane preparing for search. Photo: Reuters
The search is against the clock. It has until 3:00 in the morning on Saturday to find survivors of the submarine. KRI Nanggala-402 That was lost on April 21 while diving during a torpedo exercise.
The ship’s engine built in Germany in 1978 works Electric diesel engines This reduces its oxygen capacity (for 72 hours) compared to the latest submarines that work with nuclear reactors.
How to find an invisible ship
But how do you find a device whose cover is designed to be invisible?
Military submarines are designed to navigate the depths of the oceans without being detected by enemies or spies. Approx It does not make noise or heat It reflects the lowest possible amount of radar and sonar pulses. Therefore, most of the submarines have disappeared barely They finished successfully.
When an emergency occurs and the ship loses contact but wants to be found, the crew can draw attention Release the targets Distress towards the surface or by colliding with the hull of the boat to emit sound signals under the water.
Sonar is important in this type of operation because the underwater sound propagation system makes it possible to detect objects submerged in the depths of the sea. No vision.
Photo of the missing submarine, KRI Nanggala-402. Photo: Reuters
It’s the same technology that submarines use (and a similar mechanism to that used by dolphins). It makes a sound, then bounces off the ocean floor and is picked up by a microphone. But if the hull of a submarine was made of a material capable of absorbing sonar sound, it could be mistaken for a ship A large mountain of sand Instead of an artificial boat.
Indonesian Navy Commander Udu Margono said that they had found A. Fuel slick In the Bali Sea, four hours after the ship disappeared. An object of “high magnetic strength”, which could be a submarine, was seen “float” at an altitude of about 50 or 100 meters.
Crew members may have fired fuel for the Lighten the vessel Or to give indications of its location.
Submarine KRI Alugoro is in the process of searching for the lost ship. Photo: EFE
However, another explanation for the stain, he added, is that it is caused by A. Tank rupture From the fuel that caused the device to sink to about 500 or 700 meters, since the water pressure is greater than the submarine hull can withstand. However, where the spill occurred is where They focus Research tasks.
According to information from the Indonesian military, the submarine began diving at 3.46 local time on Wednesday, and after about 15 minutes it began loading torpedo tube No. 8. The last contact with the crew took place at 4.25 local time and before permission to launch the torpedo. disconnected With the ship.
Accidents without survivors
Submarine accidents are often catastrophic. In 2000, Russian nuclear submarine Kursk It suffered internal explosions and sank during maneuvers in the Barents Sea. Most of its 118 crew members died instantly, but 23 men fled to a rear compartment before later dying, most of them from suffocation.
In November 2017, the Argentine submarine ARA San Juan with its 44-man crew disappeared in the South Atlantic. Photo: Reuters
In November 2017, the Argentine submarine ARA San JuanHe disappeared with 44 crew members in the South Atlantic.
The search continued For months His remains were not found until nearly a year later, at a depth of 800 meters.
But in 2005, seven men on board a small Russian submarine were rescued nearly three days after their ship was trapped by fishing nets and cables in the Pacific Ocean. They only have six hours of oxygen left before reaching the surface.