Fragments from the submarine were found during a search operation. When the submarine of the Indonesian navy carried 53 divers into the Bali Sea during a periodic training exercise, it may have been pulled into the abyss by an invisible but powerful force. Indonesian naval officials suspect an inner wave, known to have occurred in the waters around Bali, could have caused the sinking of the KRI Nanggala 402. (According to Britannian Dictionary: Side Wave) in, a kind of gravity wave that occurs on internal “surfaces” in ocean waters). The KRI Nanggala 402 sank to a depth of 838 meters, far beyond the reach of the rescuers. As the crew members’ personal belongings surfaced and the ship’s oxygen supplies dwindled, officials said there was no possibility of anyone surviving. The question remains: What happened? Many theories have been put forward but the authorities say there is evidence that an underwater wave – which could induce a vertical tensile force below sea level – occurred in the Bali Sea around the time. The submarine disappeared last Wednesday morning. The Lombok Strait between the islands of Bali and Lombok is believed to be famous for its violent underground waves on an almost bi-weekly basis. NASA, the US space regulator, says the combination of strong tidal currents, rough ocean floor and water exchange between two channels – one shallow and one deep – “tends to combine around 14. once a day for exceptionally strong tidal currents. Indonesian naval officials believe this natural phenomenon is more likely to be the explanation for the submarine disaster than other theories have been put forward in recent days. The waves inside are barely discernible on the ocean’s surface, but underwater, they can reach towering heights. The waves inside can look like ripples on the ocean’s surface, like this satellite image taken by NASA in 2013. (Wikimedia Commons: NASA) Rear Admiral Muhammad Ali, former commander of the KRI Nanggala 402, and now the Indonesian navy planning and budgeting assistant, said an internal wave was essentially “a strong electric current that can pull a submarine. vertically so it will sink faster than usual. ” “Our suspicions were directed towards natural conditions. Because an undercurrent appeared at that time in the north of Bali,” he told Indonesian media. Naval officials said images from Japan’s Himawari 8 satellite, as well as Europe’s Sentinel satellite, showed massive underwater waves coinciding with the sinking of the KRI Nanggala 402. . “It moves from the bottom to the north and there is a groove between the two waves,” said Rear Adm. Iwan Isnurwanto, Commander of the Indonesian Navy Command and General Staff School. “The wave speed is about two knots and the amount of water is about two to four million cubic liters.” Admiral Iwan explained that an inner wave could render the crew powerless in the face of nature. “Once the water swept along and pushed the ship down, what else could we do? There is no safety measure that can fix that.” Other theories about what happened to the submarine have also emerged. Some suggested that this submarine was hit by a missile from a foreign ship, or even lost power. But naval officials said the submarine was still trackable when it began diving for torpedo drills and “the lights were on” – meaning there was only a small chance of power outages. They also denied that the ship was overloaded, a theory that had 53 crew members on board but only 34 beds, instead arguing that the crew was divided into three shifts and took turns sleeping. “The submarine was originally for 33 staff members, then modernized to meet our need to have 50 staff on board,” said Admiral Iwan. Officials said the submarine was also designed to carry eight torpedoes – weighing about a ton each – but only four at the time of the disaster. Many other experts point out that metal fatigue due to cracking or corrosion and that the age of the parts is the more likely cause. KRI Nanggala 402 was built in 1978 and last overhauled in 2012, almost a decade ago.

The KRI Nanggala-402 submarine sinking tragedy of Indonesia, making the entire crew and commanding officers, in fact completely avoidable, if the country’s naval forces pay more attention to safety standards. ship operation. As a 40-year-old submarine, Indonesia’s KRI Nanggala-402 is likely to have had problems with improper maintenance. However, it is likely that this ship will not be salvaged, and the cause of the incident will forever be unraveled. There have been many similar submarine tragedies in the past, but the causes of these incidents are often unknown due to being classified as a state secret, or simply by submarines. was broken, it was impossible to determine the exact cause. In 2017, the ARA San Juan submarine of the Argentine Navy sank during a patrol off the waters of the country. The ship sank with all 44 crew on board, and all initial search attempts were unsuccessful. It was not until a year later that the San Juan was found in the South Atlantic. The reason for the shipwreck was simply described as “technical error”, the long search and the ship lying at a depth of up to 900 meters, which caused the ship to be completely destroyed. China also had a similar tragedy in 2003, when its diesel-electric submarine, number 361, sank with 70 crew members. The cause of the incident was not disclosed much by the Chinese media, some sources said that the submarine was functioning well, a fault in the ventilation system, causing the entire crew to suffocate. Due to the loss of the crew’s control, submarine 361, with all the crew and commanding officers, crashed into the sea floor. However, the official cause of the incident has never been made public by China. The most horrifying submarine tragedy in history, and best known, is that of the nuclear submarine Kursk, which occurred in August 2000. The Kursk nuclear submarine sank off the Barent waters, killing 118 crew and commanding officers. Russia then salvaged this submarine ashore, to find out the exact cause of the incident. Based on Russian evidence found after the Kursk was salvaged, it has been determined that 23 Russian sailors are still alive in the escape compartment after the bow explosion occurred. However, the Russian side, partly incapable of rescue, partly subjective, said that no one survived, so decided not to organize the rescue of people, but only tried to salvage the ship from the beginning. . Many comments also said that the Kursk submarine has a lot of military secrets, so the Russian side does not want to ask the West to participate in the process of rescuing people still trapped in the ship. Russia itself, knowing that there are still survivors inside the ship, does not have enough access to equipment, the only way is to ask the Western assistance. Another tragedy involving submarines built in the Soviet Union, which occurred in 1989, was the K-278 Komsomolets. Soviet nuclear submarines sank off the coast of Norway, still emitting extremely dangerous radioactivity. Unlike the aforementioned tragedies, the K-278 was in trouble due to the poorly operated crew of the ship, the ship was burnt in time and surfaced to evacuate, before sinking completely into the seabed. However, 42 out of 69 crew members died, of which most died from hypothermia after hours of soaking in the cold sea water, while others were killed by sinking with the ship in an attempt to save. living ship is sinking. Another terrible submarine accident involved the Soviet Union, the K-8 submarine tragedy that occurred on April 8, 1970. The K-8 submarine had a problem with 52 crew members on board, all killed. Initially, the K-8, after the incident, was able to float to the sea surface, the entire crew safely escaped. Then the tug of the Soviet Navy appeared, trying to tow the submarine back to the port. During the towing process, all 52 crew members returned to the submarine, into the operational position. On the way back to port, the K-8 submarine sank with all crew members, killing 52 people. The incident took place in the waters of Biscay. Photo source: BI. The Komsomolets submarines of the Soviet Navy are still emitting radioactivity in the seabed off the coast of Norway. Source: RT.

Submarine KRI Nanggala-402. Choking because of CO2 CNA quoted Mr. Clark – a naval expert – who used to be a submarine sailor – as CO2 accumulating in the KRI Nanggala-402 submarine can suffocate the crew even if they have not exhausted oxygen. “CO2 needs to be filtered out of the atmosphere with a chemical. But this chemical will soon run out. Oxygen can be produced by chemical candles. But CO2 will suffocate the crew before running out of oxygen. ” The power outage also affects the crew’s lifetime, Clark said. Electricity is needed to operate the CO2 absorber and the fan transfers air through the oxygen candle. The Indonesian lifeboat joins the search for the KRI Nanggala-402 submarine. Photo: AP Why the submarine lost power? Underwater submarines often depend on battery power, Clark said. And a breakdown in the battery compartment such as fire, explosion, flooding, etc. can cause a power failure. Meanwhile, Mr. Ben Ho – naval analyst said that a torpedo explosion could also cause the submarine to lose power. “Historically, major submarine accidents have often occurred due to technical problems or weapon explosions. Indonesian submarines went missing while torpedo shooting exercises. Maybe a torpedo exploded, ”said Mr. Ben Ho. Oil spills at the location where the submarine went down on the morning of April 21. Photo: AP Submarine locator If the submarine is intact, it can be “relatively easy” to be located using sensors, Clark said. Magnetic sensors, similar to mine detection systems, can detect the steel hull of a submarine. Sound sensors can show the sound from submarines. “But the area they need to look for is relatively large. The sensors can only be effective in a small area. Searching can take a long time. ” Mr. Ben Ho, meanwhile, said that even modern sonar equipment can hardly detect the wreck of a submarine if the seabed is rough. “The submarine’s nature is inherently difficult to detect. Submarine fleets are often referred to as silent soldiers, ”said Ho. If the submarine is truly trapped at a depth of 600 meters or less, the crew has a “near zero chance of survival,” said Ho. “The grim reality is that once the submarine exceeds its maximum depth, it will explode due to the enormous water pressure.” If this happens, the explosion will be picked up by a sensor in a nearby area, he added. Rescue process Once the submarine is found, Singapore’s MV Swift Rescue can begin its mission. MV Swift Rescue is the first ship in Southeast Asia capable of rescuing submarines. Singapore’s MV Swift Rescue train. Photo: Facebook The ship can operate at sea for four weeks before needing refueling. On board is a rescue cabin named Deep Search and Rescue Six (DSAR 6). Cabin is used to evacuate crew from submarines. However, Mr. Clark warned that the biggest challenge is the lying direction of the submarine in distress. “For example, if the submarine is on its side, the DSAR 6 will be difficult to reach.” Cabin DSAR 6. Photo: Facebook According to the naval news site Naval Technology DSAR 6 is 9.6m long and can reach a depth of 500m. It is operated by two crew members and can accommodate up to 17 people. When the DSAR 6 floats to the surface and is recovered by MV Swift Rescue, the submarine crew will be transferred to a recovery chamber for treatment. The cabin can accommodate up to 40 people. Singapore and Indonesia signed a cooperation agreement to assist with submarine rescue in 2012. The agreement allows the two countries to send resources and help each other if their submarines crash. The KRI Nanggala-402 submarine went missing on the morning of April 21 while participating in a torpedo drill near Bali. On board there are 53 people, including 49 sailors, a commander and three weapons specialists. The 1,395-ton KRI Nanggala-402 was built in Germany in 1977, and joined the Indonesian fleet in 1981. About 40 countries in the world have submarines, but only a few countries have the ability to rescue submarines.

Priz AS-28 was successfully rescued New chapter in rescue history In the military history of the United States, the rescue of the Sargo-class USS Squalus submarine of the US Navy has become a major event and also a lesson in operational deployment of submarines. The incident took place on the morning of May 23, 1939, the Sargo-class submarine USS Squalus with 59 crew members began their usual test dives off Portsmouth, New Hampshine, without knowing they were about to experience a disaster. USS Squalus was the new and best submarine of the US Navy at the time. The ship was launched in September 1937 and has undergone 18 successful trials. No one thought it would fail on the 19th test, because all the systems on board were still working fine. However, due to a technical error, the technician wrongly announced the coordinates of the submerged vessel up to 8km down. Squalus dives while the main air intake valve remains open, causing tons of seawater to enter the engine bay at the rear of the ship. The sailors on board were shocked to hear the news and rushed to find a way for the ship to float. They built flooded compartments and tried to close the air intake valves but failed, before putting compressed air into the ballast tanks to allow the ship to float. The Squalus is stable with the bow pointing upwards. However, when the sailor tried to prevent seawater from entering through the vent pipe, there was a tremendous increase in pressure. The sea water suddenly flooded the front compartments and the ship began to sink to the ocean floor due to the large amount of seawater. The incident caused 26 sailors at the back of the ship to be immediately killed by water, 33 men in front of the ship survived. The Squalus sank to the bottom with the bow pointing upward at an angle of about 11 degrees, lost power completely, was unable to communicate and was in waters with temperatures just above freezing. The Sculpin was then dispatched to the Squalus’ coordinates on the last contact, but did not detect any signs of disaster such as debris or oil spills. No one aboard the Sculpin knew that they were 8km away from where the submarine was sunk. Meanwhile, the surviving sailors aboard the Squalus try to send out a call for help. Captain Naquin quickly ordered the release of a floating buoy attached to the cable and left a phone inside with the words “submarine sinks here, there is a telephone inside”. The crew constantly fired smoke bullets out, as well as pumped oil through the toilet so that the rescue team could detect smoke and oil spills in the sea. A sailor aboard Sculpin detected a streak of smoke rising into the sky and reported to the captain. The Sclupine arrives, finds the beacon and cell phone and communicates with the Squalus ship. That night, the US Navy deployed several ships anchored around the search area and turned on the headlights on the sea surface, while the crew on the Sclupine submarine tried to get close to the Squalus. The Squalus submarine salvage was rejected because it was too dangerous and risky. The rescuers had only two options: to transfer diving equipment to sailors to float to the surface, or to use a rescue cocoon from above, but this equipment had not been verified. The first option was canceled because when the sailors exited the submarine, it was very susceptible to cold and high pressure under the sea. The next day, the divers used the rescue cocoon. They performed four rescues with the last man on the surface at midnight May 25. This rescue campaign opened up a new chapter in the history of underwater rescue. Difficult to save because of “invisibility” Military submarines are originally designed to travel undetected under the ocean. Except when there is a need to contact headquarters, the ship will not transmit any signal. Meanwhile, the submarine detector is only really effective when finding a ship that is “in the middle of the sea or floating on the surface”. In fact, the submarine’s submarine stealth is a double-edged sword. With each passing hour, the hopes of saving the ship became less and less. Sailors will have to reduce their activity and move to reduce their oxygen consumption while they wait to be rescued. Although they have been trained in emergency self-rescue, their chances of survival depend on the depth of the ship. On August 5, 2005, the Russian submarine Priz AS-28 and its crew of seven were trapped at a depth of 190 meters below sea level after the propeller was caught on an undersea cable. The sailors were trapped in darkness on the cold ship and the oxygen supply dropped. This accident has attracted much attention because it happened just five years after the sinking of the nuclear submarine Kursk (in 2000), killing all 118 sailors. The Russian government immediately requested US and UK assistance; at the same time to plan to rescue the ship. The first was the scheme to detonate the anchor system of the Russian surveillance antenna system installed under the sea (weighing 60 tons), but was rejected because it was not feasible. By the end of August 6, the command decided to hook the cable to the ship, tow the ship up close to the water surface so that the crew could rescue the sailors. But this plan also failed. On the night of August 6, the race against time reached its peak because the oxygen in the train was only able to endure until August 7. The British Super Scorpio 45 unmanned submersible has entered the game. According to commander Jonty Powis, an expert on British submarine rescue and rescue, the campaign went smoothly. The ship has successfully severed the cables that are clutching the Priz submarine. Commander Powis praised the Russian government’s openness to allow rescue parties to intervene in the area that was once one of the most secretive parts of the Soviet Union before. After just 3 days of being stranded under the sea, the ship finally emerged. All 7 crew members are healthy. Although suffering from the cold and the oxygen in the ship was gradually running out, when rescued, sailors were able to open the submarine’s cover and move to the lifeboat without assistance. According to the examination results at the hospital, the health of all 7 people was still normal and did not need any special treatment. This shows that the crew responded very professionally to the extremely strict situation in the ship stranded at a depth of 190 meters under the sea. They wore insulation to keep their bodies warm, maximized energy savings by only intermittent contact with the mainland and tried to stay calm so as not to lose the meager oxygen on board.

The Indonesian navy KRI Nanggala-402 went missing on Wednesday. Alex Widojo / Anadolu Agency / Getty Images The search for a missing Indonesian Navy submarine has been going on for days, and time is running out, hopes seem to have faded. “The submarines are designed to be hard to detect, this is a problem that can happen when one sinks,” said Bryan Clark, a former US Navy submarine officer. Submarines are built to penetrate enemy waters, engage and engage enemy navies, shoot at ground targets with cruise and ballistic missiles, and even deliver force. amount secretly entering enemy territory / territorial waters. Not all submarines can perform every task, but regardless of the mission and the ship’s capabilities, stealth is considered to be of primary importance. The KRI Nanggala-402 is a German-made diesel-electric attack submarine that is more than 40 years old. Due to the age of the submarine, it may lack the coating and stealth features of newer ships, even after being refurbished in 2012, giving search and rescue teams a bit of an edge. as they try to look for it, but other challenges will overwhelm any potential advantage. In the event of an emergency, the submarine can either trigger a “ping” device on the ship or send a buoy to monitor (if the Indonesian submarine has these systems and the systems are in operation as well. the submarine crew knew how to use them and did not lose their ability to act). A “ping” signaling device is extremely valuable because it allows search and rescue teams to use passive sonar to scan a larger ocean area with other tools. There is no indication that KRI Nanggala-402 is making a sound that would aid with the search. Mr. Clark, a defense expert at the US Hudson Institute, speculates that if the ship makes a sound, it may have been located. “If it makes a sound no matter what form it is, it will be much easier to find,” he said. Without a ping or other type of noise, search and rescue teams are limited to using active sonar, narrowing the scanning range and prolonging the time it takes to search for a site. field. While passive sonar involves listening to sounds coming from objects in the ocean, sonar actively emit pings and then listens for echoes from objects in the ocean. The Indonesian navy identified the submarine disappeared in the waters north of Bali island. Search teams soon noticed oil slicks in their search area, narrowing the scope of interest. In this common area, search units found an object with “strong magnetic resonance” that could be emitted from the missing submarine. While these developments have significantly reduced the overall size of the search area, there is still a lot to consider. Indonesia has dozens of ships and aircraft, supported by international forces participating in the search. The Indonesian navy said the ship may have sunk at a depth of more than 600 meters, which would certainly complicate the search. Not only does that depth exceed the maximum depth of the ship, potentially putting the hull in danger of rupture, but it could also leave it out of the reach of existing recovery options. Finding things on the ocean floor is also quite difficult, Mr. Clark said. “Like we’ve seen with so many airline crashes, it’s hard to find something, even big, when it falls to the sea floor, because it’s mixed up in the mess down there,” he said. The ARA San Juan submarine of the Argentine navy went missing in 2017. It wasn’t until a year later that search teams found the ship, 44 crew members killed, on the ocean floor at a depth of about 1,000m. “If a diesel submarine as small as an Indonesian submarine sinks more than 600 meters, it is unlikely to survive,” Clark said.

The Indonesian Ministry of Defense has also officially confirmed that the oil spill on the sea surface that has just been found near the location of the lost submarine is leaking oil from this ship, the Indonesian Army also announced a list of 53 people on board. underground “bad fate” KRI Nanggala 402. The image of oil spill on the sea was published by Indonesia on April 22. Source: Sina. It is known that at about 3 am on April 21 (local time), the Nanggala submarine disappeared in waters about 95 km north of Bali. According to the Indonesian Navy, the submarine may have fallen into a sea trench up to 700 meters deep, while the maximum diving capacity of this old submarine was only about 300 meters. Indonesia has formally requested international assistance, and Singapore, India, Australia, as well as all countries with submarine rescue capabilities and equipment have responded. According to a report on the Indonesian media Indopolitika page on April 22, the Indonesian Navy announced a list of 53 members on the Nanggala submarine, and said there were at least 53 crew members or joint staff on board. concerned. The Indonesian navy has sent several rescue teams to search for the submarine. The Nanggala submarine of the Indonesian navy is a 209/1300 class conventional submarine purchased from Germany in the end of 1980. It is forecasted that the search and salvage of this ship will be very difficult. The incident with the Indonesian submarine Nanggala was the second sinking of the submarine of this class. Earlier, in November 2017, the ARA San Juan submarine of the Argentine Navy also had an accident underwater and sank to a depth of 800 meters, all 44 people on board were killed. The ARA San Juan is also a Class 209 submarine. ARA San Juan submarine of Argentina. Source: Sina. It is known that on November 15, 2017, while returning to the base in the coastal city of Mar del Plata, the ARA San Juan submarine suddenly lost contact with the mainland. The Argentine Navy said earlier that the captain of the ARA San Juan had reported water spilling into the ventilation pipe, causing one of the ship’s batteries to short circuit. Hours later, “an explosion” is believed to have occurred near the ARA San Juan submarine site that was last identified. The Argentine Navy suspected that the cause of the explosion could be the “condensed hydrogen phenomenon”. The ARA San Juan is a German diesel-powered class 209 submarine that entered service in the mid-80s of the last century and is most recently refurbished in 2008-2014. With a refurbishment cost of up to 12 million USD, the ship can replace the engine and the energy generation system. During the repair process, experts warn of difficulties because innovation involves integrating systems produced by different manufacturers, even the slightest mistake in the repair phase. could put the safety of the ship and the life of the sailor in danger. After the incident, it was not until a year later that Argentina found the wreck of this ship with its crew. On November 17, 2018, the Ministry of Defense and the Argentine Navy announced that the US Ocean Infinity Company had discovered an object about 600 meters long on the ocean floor, confirming that this was the missing ARA San Juan submarine. The ARA San Juan submarine was found at a depth of more than 900 meters off the Valdes peninsula in the Patagonia region of the Atlantic Ocean, about 600 kilometers from the Argentine port city of Comodoro Rivadavia, the Argentine navy said. Since the ARA San Juan submarine went missing, Argentina has relied on 14 countries such as Russia, the US, the UK, Norway … to participate in the search campaign, in which Russia and the US are the two most experienced countries. in the search and rescue field. Russia has sent ocean research ships and transport aircraft Antonov carrying a searchable robot at a depth of 1,000 meters under the ocean to search. Meanwhile, the US also deployed P-8A Poseidon patrol aircraft, mini submarines, and released buoys attached to sensors for detection.

The news comes a day after debris believed to be from submarine KRI Nanggala-402 was found floating away from the submarine’s last communication capture location in the Bali Sea. Tjahjanto said during a press conference that the Indonesian warship Rigel scanned the area with sound waves, using sound waves to locate objects and magnetometers. Then the MV Swift Rescue from Singapore sent a remote control vehicle (ROV) to get a clearer underwater visualization of the wreck, he said. The wreck of the submarine was found – Photo: Indonesian Navy According to Mr. Tjahjanto: “We have found and photographed parts of the Nanggala submarine such as the transverse steering, the anchor, the outer hull, the vertical steering and other parts of the submarine such as the safety clothing for the crew. Based on that evidence, I declare that the Nanggala submarine sank and the entire crew is dead. ” Indonesian Navy Chief of Staff Yudo Margono said the submarine was found at a depth of 850 meters and broke into three parts. He said the Indonesian government will work with the International Submarine Rescue and Escape Liaison Office “because salvage of the Nanggala submarine will require international cooperation”. The KRI Nanggala 402 is one of two Cakra attack submarines, the German-made Type 209 submarine and exported, and was commissioned by Indonesia in 1981. This submarine is 59.5 m long, 6.2 m widest, with a diving displacement of 1,390 tons. The ship operates by diesel-electric engine, cruise speed when diving is 21.5 knots (nearly 40 km / h), range of 15,200 km. Previously, The Guardian reported on April 21 from the Indonesian navy that power outages occurred while the KRI Nanggala 402 was diving, causing the ship to lose control and unable to conduct emergency procedures to allow the ship. rise.

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.

“We are lifelong friends,” said Frans Wuwung. Wuwung is a retired sailor who trained soldiers on the KRI Nanggala-402 – one of the five submarines of the Indonesian Navy. Before dawn on April 21, Sergeant Guntur Ari Prasetyo and 52 comrades took turn to get off the Nanggala-402 to start torpedo shooting exercises in the waters of the South Pacific. On the ship was also Colonel Harry Setyawan, commander of the Indonesian submarine fleet. Captain Harry’s sailor career began primarily on the Nanggala-402, after he graduated first class from the naval academy. Around 3 o’clock, the Nanggala-402 was allowed to begin a torpedo drill in the waters north of Bali Island. As the dark hull had just descended into the dark water, silence filled the sea surface. Outgoing communication received no response. The Nanggala-402 has been lost. Immediately, ships and aircraft from many countries gathered in Bali sea in hopes of searching for the Nanggala-402. In everyone’s mind, there is a constant fear that the submarine will run out of oxygen at 3 a.m. on April 24, 72 hours after contact was lost. There was evidence that the submarine was sinking On the afternoon of April 24, Chief of Staff Yudo Margono of the Indonesian Navy announced that the debris had been found just a few miles from where the ship was missing three days ago. These fragments confirmed the submarine had sunk to the bottom of the sea and cracked. The ship was declared “sunk” instead of “missing”. Several floating objects identified at sea were dropped from the Nanggala-402, including several prayer mats, special foam used to wipe condensed water, and periscope grease bottles. The bodies of the sailors have not been found, the Chief of Staff said. Meanwhile, follow Jakarta Globe Admiral Yudo Margono also said that the search team is still waiting for a miracle and will continue to search. Indonesian military observer Susaningtyas NH Kertopati said the sailors could breathe slowly to prolong the amount of time they had left with oxygen. “They are trained to do it,” she said. Fragments and objects found were displayed in front of the reporter during the April 24 afternoon press conference. Photo: Reuters. According to Mr. Yudo, the multi-beam sonar technology shows that the Nanggala-402 has sunk to a depth of 850 m, which exceeds the safe depth. The safe over-water pressure is so great that a steel-hulled submarine can be crushed. Although the Nanggala-402 fell into an undersea valley and a compartment in the vessel was not submerged, the ability to survive at such a depth with finite oxygen was very low, according to Susaningtyas Nefo Handayani Kertopati, a love analyst. newspaper and the Indonesian army. “They will fall into a state of panic. Just being locked up in our room would panic. While this is a depth of 850 m. We’re just human after all, ”said Susaningtyas. What caused the ship to crash? The reason why the ship was powered by a deep-sinking electric diesel engine is unknown. But naval experts believe that the Nanggala-402 dive is more likely to happen quickly and suddenly because the ship does not send an emergency call. Norman Polmar, the American historian of submarines, said that the Nanggala-402 was likely to sink due to internal damage. It could be that the piping was damaged causing water overflow or the battery could explode. Shortly before her disappearance, the Nanggala-402 took part in another torpedo drill but had “imperfect” results because of the missed target, according to Rear Adm. Julius Widjojono, spokesman for the Navy. Indonesia. After that, the ship was asked to rehearse again. This is the operation that the ship was about to perform at the time of its disappearance, Rear Admiral Widjojono said. Susaningtyas expert questioned whether the continued short-term deployment of the Nanggala-402 would give the ship enough maintenance time. “The ship has been forced to do this activity in the Bali Sea, very forcefully. Chief of Staff must accept responsibility, “Susaningtyas said. The Nanggala-402 was built in 1977 and completely rebuilt in South Korea in 2012. The Indonesian navy said the ship’s papers were fine. But according to an unnamed defense expert, the submarine may not have been fully maintained since May 2018. The Indonesian naval expert hypothesizes that seawater overflows the ship as it sinks, be it through pipes or torpedoes. Under perfect conditions, the crew may have a way of plugging the gap, but emergencies rarely do so. When a torrent of water flooded in, the pressure could cause the ship to sink immediately. “The ship will sink very quickly, like a rock,” said Soleman Ponta, a military analyst. The Indonesian naval ship participated in the search for the KRI Nanggala-402 submarine. Photo: Reuters. “Pray for me” The day Sergeant Guntur Ari Prasetyo, a diesel technician on the Nanggala-402, left his home in Surabaya, he once told his wife to pray for him. This is what he does every time he is mobilized. Berda Asmara, the wife of sergeant Guntur, followed her husband’s words but this time something was wrong. “Perhaps he had a hunch before he left. He looks different from usual, ”Berda said on April 24. At the same time, in the city of Sidoarjo, an hour’s drive from Sergeant Guntur’s house, Colonel Harry’s family was also praying. Waiting for the good news here is Sheeva Naufal Zidane, the 18-year-old son of Colonel Harry. “From a young age, I wanted to be in the submarine because my dad was cool,” Sheeva said. When the TV reported that the submarine debris was found, everyone in the house got close together. Sheeva applied canola oil to her mother’s legs while the woman cried. The atmosphere rang out prayers. Winny Widayanti, wife of Colonel Harry, said her husband has never lost his temper at work, even in the worst traffic jams. She said she was haunted by debris in the Bali Sea but that would not make her lose faith. “There is still hope. I won’t stop hoping. They will survive. It’s not over yet, ”said Mrs. Winny.

Search helicopters and many other ships left Bali and a naval base in Java headed for the area out of contact with the KRI Nanggala-402 on April 21 as she prepared to conduct a torpedo exercise. . If the submarine was still intact, officials said it would only have enough air for the crew members to survive until around dawn April 24. “So far we have not found it … but with existing equipment we can find the location,” – Achmad Riad, a spokesman for the Indonesian army, said during a press conference. An Indonesian air force pilot said six tons of equipment had been moved to a base to help with the search, including an underwater hot air balloon to help lift the ship. One of the Indonesian military ships involved in the search for the submarine – Photo: Reuters The Indonesian navy said it was investigating whether the submarine lost power when submerged and could not perform emergency procedures when it sank to a depth of 600-700 meters, exceeding the allowable limit. The Chief of Staff of the Indonesian Navy – Yudo Margono said an object with “high magnetic force” was found “floating” at a depth of 50-100 meters and an earlier aerial search had detected a trace. The oil spills near the location where the submarine last caught the signal. Navy spokesperson Julius Widjojono said the diesel-electric submarines can withstand depths of up to 500 meters but surpassing this threshold can kill people inside. The Bali Sea can reach a depth of more than 1,500 meters. One of the men on board was the commander of the Indonesian submarine fleet, Harry Setiawan. The submarine was commissioned into the Indonesian fleet in 1981 and underwent refitting in Korea, completed in 2012. It was said to be in good condition before meeting, the Defense Ministry said. accident. Australia, India, Malaysia, Singapore and the US have sent special ships or aircraft to respond to Indonesia’s request for assistance. The US military is sending a P-8 Poseidon to assist with the submarine search. The Pentagon said US Defense Secretary Lloyd Austin spoke with his Indonesian counterpart and offered additional assistance, which may include navigating underwater search equipment. Two Australian Navy ships are also heading to the search area including a frigate with special sonar scanning capabilities. Indonesia operates five submarines – 2 German-made Type 209s and three newer Korean ones.

KRI Nanggala submarine at naval base in Surabaya, Indonesia, February 20, 2019. (Photo: AFP / VNA) The Pentagon on April 23 said US Secretary of Defense Lloyd Austin offered to provide his Indonesian counterpart Prabowo Subianto with underground weapons to assist in the search for a lost Indonesian submarine. The Pentagon statement emphasized: “Defense Minister Lloyd Austin this morning discussed with Indonesian Defense Minister Prabowo Subianto to express concerns about the disappearance of the Indonesian submarine KRI Nanggala 402 as well as the fragile division of the 53 crew members on board. ” The Pentagon also noted that the two sides had discussed the recent deployment of the P-8 Poseidon to aid the search. Minister Austin has proposed to increase support, possibly including the provision of underwater search assets, for this effort. Show the army Indonesia deployed two naval submarines capable of detecting submarines to assist with the search. The KRI Nanggala 402 was suspected of having a total power outage while still diving in the Balinese waters on the morning of April 21 before sinking at a depth of 600-700 meters./.

P-8 Poseidon hunting plane. Photo: The Drive According to the CNN In addition to the US P-8 submarine hunting aircraft, a frigate with sonar scanners and an Australian helicopter are also participating in the search for the Indonesian KRI Nanggala-402 submarine. Meanwhile, deep-sea lifeboats are en route to Indonesia from India and Singapore. Indonesian officials said on Friday that if the submarine was intact and working properly, the sailors would only have enough oxygen to survive until dawn Saturday. “So far, we haven’t found it yet. But with existing equipment, we may be able to locate the submarine, ”Achmad Riad, a spokesman for the Indonesian military, said at a press conference. Submarine KRI Nanggala-402. Photo: USN Collin Koh, an expert at the Indonesian Institute for Strategic and Defense Studies, said that assuming a submarine has enough oxygen for 72 hours is an optimistic statement, as the submarine’s oxygen-generating capacity will be limited during power outages. . “So it’s possible that the oxygen has run out,” Koh said. Experts like Koh said Indonesia will have to expand the search area again if the highly magnetic object proves not to be a ship. Koh also warned that if the submarine falls to “extreme depth”, it will be almost impossible to find. The Bali Sea can reach a depth of more than 1,500 meters. At the time of his disappearance, there were 53 people on board. Including commander of Indonesian submarine fleet – Mr. Harry Setiawan. KRI Nanggala-402 submarine went missing on the morning of April 21 while participating in a torpedo drill near Bali island. On the morning of April 22, oil spills were discovered at the submarine’s diving location. On the morning of April 23, a metal object with a high magnetism was found. But since then, there have been no more clues. On the morning of April 24, the reserved oxygen on the ship was exhausted.

KRI Nanggala 402 submarine Therefore, the focus of current attention will be to salvage the ship’s wreck from the waters off the coast of Bali, Indonesia. Previously, the Chief of the Indonesian Navy Yudo Margono said on April 23 that the country’s rescue team discovered an object with “high magnetism” floating at a depth of 50 to 100 meters off the north coast. Bali island, near where submarine KRI Nanggala 402 was identified lost contact. They are preparing to deploy naval ships equipped with hydroacoustic systems to the area, to confirm whether this is an object from this submarine or not. After the KRI Nanggala 402 went missing, the navy of Singapore and Malaysia sent warships to join the search, while a series of other countries such as the US, Australia, Germany, France, Russia, India, Turkey Ky and South Korea also offered assistance. Information from the TNI military website said that the missing KRI Nanggala 402 submarine was built in Germany and put into service with the Indonesian navy since 1981. This ship has undergone a two-year refurbishment process. Korea and completed in 2012.

Yudo Margono, the naval chief of staff, told reporters that authorities had found an object with “high magnetic force” floating at a depth of 50 to 100 meters. Authorities hope the object could be the missing submarine and are currently waiting for a naval ship with underwater detection facilities to help them investigate the object further. The Indonesian military has so far declined to comment on whether the decades-old submarine, carrying 53 crew, is overpowered. Submarine KRI Nanggala-402 – Photo: Reuters However, they said the submarine may have sank to great depths after a power outage left the crew unable to control the ship. If the object is found to be part of the submarine, the navy suspects the crew may have discharged its fuel load after a power outage to allow the submarine to float. Navy officials feared the submarine might explode. Collin Koh, a naval expert and research fellow at the S. Rajaratnam School of International Studies in Singapore, said damage to the fuel tank could cause “big trouble”. Naval spokesperson Julius Widjojono previously told KompasTV that a battery-powered submarine when submerged could only maintain a depth of 250 to 500 meters. “Anything that makes it go deeper than that can be fatal and dangerous,” he said. The waters in the region are shallower than in other parts of the archipelago but can still reach depths of more than 1,500 meters.

Ballarat, one of two warships dispatched by Australia to assist in the search for the missing Indonesian submarine. Photo: Australian Department of Defense It is expected that the Ballarat warships of the Australian Navy equipped with sonic radar and multi-role helicopters MH-60R will arrive in the search area on April 23. The second ship, Sirius, operating in the area off the coast of Brunei will arrive on April 27. In particular, according to the Australian Department of Defense, Sirius can provide fuel, drinking water and many essentials for ships participating in the search. Australia’s Ministry of Foreign Affairs announced earlier that it would do whatever it could to assist Indonesia in finding the submarine in distress. Meanwhile, the country’s Defense Ministry confirmed that it would keep close contact with Indonesia in case it could provide additional assistance to the search. Submarine KRI Nanggala-402 of the Indonesian Navy, along with its crew of 53, went missing on April 21 while participating in a torpedo launch exercise. The Indonesian army, along with the help of the navy, of some countries are working all out to find the ship in distress in the context that the amount of oxygen used on the ship is only enough until the morning of April 24.

Indonesian submarine KRI Alugoro searched for the KRI Nanggala submarine that was missing while participating in a drill off the coast of Bali on April 21. Photo: AP Indonesian submarine KRI Nanggala 402 lost contact after diving on April 21 off the coast of Bali, and concerns are growing that the submarine may have sunk too deep, difficult to reach and recover. President Joko Widodo has called on all Indonesians to pray for the return of the crew, and ordered every effort to be made to locate the ship in distress. Two ships left a port in a nearby area on the morning of April 23 to engage in search activity. More than 20 naval ships, 2 submarines and 5 aircraft were mobilized for search on April 22, and more large-scale search operations are expected on April 23. Lifeboats from Singapore and Malaysia are expected to be in the area from Saturday to Monday next week, and other countries have also requested assistance. In his televised speech on April 22, Mr. Widodo said: “Our main priority is the safety of the 53 crew members. To the families of the crew members, I can understand their feelings at the moment and we are doing our best to save the lives of all crew members on board. The country’s Navy Admiral Yudo Margono said the missing submarine is expected to run out of oxygen at about 3 a.m. on April 24. The search has been centered around the oil slick discovered near the submarine’s last dive site. But there is no convincing evidence that this oil streak belonged to the missing submarine. Admiral Margono said that the oil could be spilled from a crack in the submarine’s fuel tank or it could also be that the crew drained the oil and the fluids to reduce weight, allowing the ship to float. There was an unidentified object with high magnetism at a depth of 50 to 100 meters, and officials hope it was the submarine they were looking for, Margono said. The Indonesian Navy also believes that the submarine has sunk to a depth of 600-700 meters, much deeper than the landmark where the hull can withstand water pressure. According to estimates by a Korean company that repaired this submarine in the period 2009-2012, the ship could explode when it sank to a depth of 200 meters. Currently, people are still not sure about the reason why the submarine suddenly disappeared. The Indonesian navy said it was possible that an electrical incident could have prevented the submarine from performing emergency procedures to emerge. In addition to the lifeboats sent by Singapore and Malaysia, other offers of assistance have also come from Australia, the US, Germany, France, Russia, India, Turkey and South Korea. The hospital ship KRI Dr. Soeharso of the Indonesian Navy participates in the search for the missing submarine. Photo: AP Historically, submarine accidents have often had serious consequences. In 2000, the Russian nuclear submarine Kursk exploded from the inside and sank during exercises in the Barents Sea. Most of the 118 crew members died immediately, while 23, although they managed to reach the rear compartment, were suffocated. In November 2017, an Argentine submarine went missing and 44 waterways in the South Atlantic, until nearly a year later, it was discovered that the wreck was 800 meters deep. But in 2005, seven members on a Russian mini submarine were rescued three days after their ship was caught in fishing nets and cables in the Pacific, at a time when the ship had only enough oxygen for six hours. if the lake cannot float to the surface of the water. It is known that the KRI Nanggala 402 submarine is currently missing, produced by Germany, has been used by Indonesia since 1981 and at the time of the accident carrying 49 sailors and 3 gunners and commanders. Hoang Bach According to AP

Indonesian officials fear the ship may sink deeply, making it difficult to access rescue equipment. In a statement released on April 22, President Joko Widodo called on the people of Indonesia to pray that the crew can return safely. He also ordered all-out use to locate the submarine in distress. More than 20 naval ships, two submarines, five aircraft were mobilized to participate in the search campaign. Lifeboats from Singapore and Malaysia have also arrived on the scene to provide assistance. “Our main priority is the safety of the 53 crew members” Mr. Widodo stressed. Indonesia races against time to rescue the KRI Nanggala-402 submarine. (Photo: Anadolu) Naval Chief of Staff Adm Yudo Margono said, KRI Nanggala 402 is expected to run out of oxygen at 3 am on April 24. Searches are currently concentrated around the oil slick found next to the last dive site of KRI Nanggala 402. But there is currently no evidence that the oil stain was left by a submarine. Margono said the oil could spill from a crack in the fuel tank or the crew could discharge fuel to reduce the weight to help the vessel float. The Indonesian rescue team also found an unidentified highly magnetic object located at a depth of 50-100 m. Officials of this country hope it is the lost ship. However, the Indonesian navy did not rule out the possibility that KRI Nanggala 402 had sunk at a depth of 600-700 m. This depth could crush the ship due to the water pressure. The cause of the disappearance is still unknown. Indonesian officials said the power outage may have prevented the submarine from going through the emergency procedures to float again. In addition to the lifeboats sent to Singapore and Malaysia, Australia, the US, Germany, France, Russia, India, Turkey and South Korea are offering to help Indonesia. Submarine accidents are often catastrophic. In 2000, the Russian nuclear submarine Kursk exploded and sank during a maneuver in the Barents Sea. Most of the 118 crewmembers died immediately, but 23 escaped into the rear compartment before dying because the Russian navy could not find them in time. In November 2017, an Argentine submarine carrying 44 crew members went missing in the South Atlantic. Nearly a year later, the ship’s wreck was found at a depth of 800 meters. But in 2005, a group of seven sailors aboard a small Russian submarine were rescued almost three days after their ship was hooked to a cable at a depth of 190 meters. By the time the cable was cut and surfaced, the amount of oxygen on board was only about six hours. The Indonesian Ministry of Defense said that the German-made diesel-powered KRI Nanggala 402 entered naval service in 1981. The ship carried 49 sailors, one commander and three gunners when it went missing.