Submarines are the most important military means to help countries gain advantage from the seabed, but that feature makes it difficult to find when missing and often leaves severe consequences when in distress.
Indonesian submarine went missing with 53 sailors
Indonesian submarine KRI Nanggala 402 and a crew of 53 people last contacted the headquarters at 3 am on April 21 to ask for permission to dive into the sea during torpedo drills off the coast of Bali and then lost contact completely. Full from 4:30. The Indonesian navy said it had a power failure while diving, causing the ship to lose control. 
Indonesian KRI Nanggala 402 train. Photo: Getty Images In recent days, Indonesian officials have deployed 3 submarines, 5 aircraft and 21 military ships to search for the KRI Nanggala 402. Sonar sonar systems have also been deployed to search for motion and sound below. country but not yet have satisfactory results. Indonesian officials confirmed the amount of oxygen stored on board only enough for 3 days after the power failure. This morning (April 24), that deadline has passed, making the prospect of finding surviving sailors nearly dissipated. Indonesia is expected to turn the rescue of sailors into submarine salvage missions. The Indonesian Navy said the submarine was most likely to sink at a depth of 600-700m, but the KRI Nanggala 402 usually only operated at a depth of about 250-500m. Anything greater depth is dangerous because the water pressure on the hull can crush the hull. Tragedy of ARA San Juan, 44 Argentine soldiers were killed In November 2017, Argentina’s ARA San Juan diesel-powered submarine went missing about 430km off the Argentine coast with 44 sailors traveling from Ushuaia base to the city of Mar del Plata. 
ARA San Juan Front Section. Photo: AP During the last communication, the ARA San Juan reported a problem with the machine due to water overflowing through the vent pipe, causing a short circuit of a battery. Three hours after this announcement, a sound like a loud explosion appeared about 50 km away from where ARA San Juan last informed. Argentina started its ARA San Juan search campaign with support from 15 countries, including Russia and the US, but stopped it a few weeks later because there was no significant clue. By 2018, the ship’s wreck was found at a depth of 900m. The Navy said it found debris 11, 13 and 30 meters long, the hull was crushed inside. Argentina admits it does not have modern technology to bring submarines back to land and has not decided how to handle the wreck. The Kursk submarine sank in the Barents Sea with 118 sailors Around 11:30 a.m. on August 12, 2000, while doing exercises to fire fake ammunition in the Barents Sea, two major explosions in a row suddenly occurred inside the nuclear submarine K-141 “Kursk” of the Russian Navy. A few minutes later, Kursk slowly sank to the bottom of the Barents Sea. Unlike the disappearances, the Kursk was located shortly after it crashed. But despite a series of quick relief measures, the Russians could do nothing more, all 118 sailors and officers died. 
The Kursk submarine broke in two after the tragedy. Photo: TASS The last time the ship was seen surfacing in port was around 5:00 a.m. on August 12, 2000. In the Severomosk area, the Northern Fleet, the ship slowly advanced from the port of Murmansk to the Barents Sea during a mock torpedo shooting exercise. Joining the K-141 Kursk was another ship of the Typhoon class and the K-114 “Tula” (Delta IV class). Over the past 20 years, many different theories about the accident of the state-of-the-art nuclear submarine Kursk have been issued, many believe that the disaster was caused by a fault in the design or Russia violated the rules. weapon maintenance. 
Kursk submarine in the photo taken in April 2000. Photo: S. Volkov One theory is that the Kursk submarine was mistakenly shot by an American submarine operating in the Barents Sea and the two sides negotiated to “close down” the incident to avoid a military conflict that could push the whole world. world into the dark scene. Meanwhile, according to the final conclusion of the Investigation Committee of the Russian Government, the cause of the sinking was an explosion that occurred while the ship was preparing to launch a torpedo on a simulated target during the exercise. . Submarine K-8 sank due to fire At the time of launch, the Project 627A Kit (November class) K-8 attack submarine was considered the pride of the Soviet Navy. But the ship also authored a tragedy that took the lives of 52 sailors in 1970. According to RBTH, a fire broke out in the compartment when it set sail on April 8, 1970. The captain ordered the nuclear reactor to be shut down and left the ship. 
K-8 submarine of the Soviet Union. When a tugboat arrived at the scene, 75 sailors returned to the ship in an attempt to bring the K-8 back to base. However, the ship was anchored off and lost control in rough sea conditions. 52 sailors who returned to the ship died from CO2 poisoning before rescuers could reach them, 23 were saved. The K-8 then sank to the sea floor with four nuclear torpedoes at a depth of 4,680 m and 490 km northwest of Spain. The depths were so great that it was nearly impossible to salvage the ship. Experts believe that the torpedoes carrying nuclear warheads on the sea floor could lead to radioactive leakage catastrophic damage to the environment. The first nuclear submarine crashed The world entered the race to develop nuclear submarines since the outbreak of the Cold War. In 1963, the nuclear attack submarine USS Thresher became the first nuclear submarine to crash, when it crashed during a test operating at a depth of 400 meters. 
USS Thresher set sail in 1963. Photo: Getty Images The accident killed all 129 crew members on board. To this day, this is still the submarine crash with the highest death toll in history, more than the tragedy of Russia’s Kursk submarine. According to the US Navy, a malfunction in the electric motor supplying to power the main cooling pump caused the nuclear reactor to stop working, so there was no electricity to pump water out of the empty chamber for the ship to float. Thresher sank under inertia and exploded at a depth of about 730 m due to the water pressure exceeding the hull’s stamina. After the USS Thresher disaster, the US Navy adopted the SUBSAFE program to ensure the quality of the submarine from design to fabrication. US submarine mysteriously disappeared In May 1968, the nuclear attack submarine USS Scorpion, the Skipjack class of the US Navy, went missing with 99 sailors 643 km southwest of Portugal’s Azores island. The ship was scheduled to return to the port on May 27, 1968, but it did not appear. The year 1968 also marked the disappearance of four other submarines, including the Israeli INS Dakar, the French Minerve and the Soviet K-129, arousing much speculation. 
Submarine USS Scorpion. Photo: ITN According to sources, on May 16, 1968, the USS Scorpion left the US naval base at Rota (Spain) with 99 sailors, along with the USS John C. Calhoun. Scorpion was sent to observe Soviet naval activities in the Atlantic in the vicinity of the Azores. Around midnight on May 21, Scorpion sent a message to a US Navy communications station in Nea Makri (Greece) reporting that the ship was near a Soviet submarine and the team “began monitoring. Soviet Union “, and is running at a steady speed of 28 km / h at a depth of 110 meters. That was Scorpion’s last contact. To date, it is not known exactly what happened to the ship, only to be told that the US Navy launched a search operation, but there was no clue. By the end of 1969, an ocean surveying vessel of the US Navy discovered submarine SSN-589 sinking at a depth of 3,048 m. The US Navy did not provide detailed information on the accident, but some sources said that the accidental explosion of the Mark 37 torpedo caused water to flood the ship and the USS Scorpion quickly sank, before being pressured. crushed water.
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