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.

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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.

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.

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.

NW 2501 before the disaster and Captain Lind.

1. The story begins on Friday night, June 23, 1950 at La Guardia Airport, New York, USA. The weather was warm when 55 passengers, including 27 women, 22 men and 6 children, boarded a DC-4 4-turboprop aircraft, number 2501 of Northwest Airlines, from New York to Seattle (state Washington). Estimated flight time is 6 hours at 660km / h.

At 19:30, the 2501 took off. The captain of this flight is Robert C. Lind, the first co-pilot is Verne F. Wolfe, both 35 years old, and the third and last person in the crew is flight attendant Bonnie Ann Feldman, 25 years old. .

Passing Cleveland, Ohio, the 2501 continues to fly to Minneapolis, Minnesota at 3,000 meters. As she prepared to approach the city airspace of Battle Creek, Michigan at 22:41, the Chicago Air Traffic Control Center ordered Captain Lind to lower the altitude to 2,500m to avoid another plane flying in the direction. opposite.

At 11:36, the 2501 reached Lake Michigan. Upon receiving news from the Chicago Air Traffic Control Center that a storm was forming on the lake, Captain Lind asked to lower the altitude to 1,500 meters but was rejected because at such a height, the plane could will not stand the gust of wind.

At 11:51 p.m., the 2501 entered the fringes of a storm that was growing stronger. Captain Lind reported via radio that the plane would arrive in Milwaukee before 0:30 a.m. on June 24. About 10 minutes later, Lind once again asked to lower the altitude to 1,000m but did not give specific reason. The Chicago Air Traffic Control Center’s answer was still: “No way!”

That was Captain Lind’s last contact with the ground. On the other side of Lake Michigan, the Milwaukee Air Traffic Control Station, after waiting until 1 in the morning, still did not see the 2501 radio signal to New York, Minneapolis and Chicago. Immediately, the Civil Aviation Administration’s radio stations attempted to communicate with 2501 on all frequencies but to no avail. Flight 2501 is missing!

2.5:30 a.m. on Saturday, June 24, the US Civil Aviation Administration officially announced the complete loss of contact with the 2501. They also said that the amount of fuel on the plane was completely exhausted by that time so it could no longer fly, and issued an emergency search order to the navy, the coast guard and the state police from Illinois to Michigan, Wisconsin and Indiana. Thirteen hours later, at 6:30 p.m. on Saturday, the Coast Guard ship commanded by Captain Woodbine saw an oil slick and some debris allegedly from a 2501, floating on the surface of Lake Michigan. At 5:30 a.m. on Sunday, June 25, the sonar machine of the US Navy ship led by Captain Daniel Joy was near the oil spill, and found some objects that reflected very strong sonar waves. However, scuba diving conducted by a naval clone showed that it was not the wreck of the plane, but that of a shipwreck.

Also on Sunday, the Coast Guard fleet consisting of four ships led by Woodbine, Mackinaw, Hollyhock and Frederick Lee recovered many floating debris, including fuel tank fragments, seat pads, clothing pieces. , blankets, luggage and some parts of the corpse but not a single piece of debris was large enough to confirm it fell from the 2501. Investigators speculate that the 2501 exploded in the sky because of their followers. The aircraft twisted when it fell into a gust of wind, causing a spark to burn the fuel tank. Prosecutor Berrien Louis Kerlikowski and US Coast Guard officials said: “It must be a terrible explosion to tear the passenger body in an unimaginable way.” However, residents of Lake Michigan said that on the night of June 23 and 24, they heard no explosions except for the testimony of a retired naval lieutenant, RT Helm.

According to Mr. Helm, he saw an airplane passing through his house at 12:20 a.m. and then a flash of light accompanied by a terrifying explosion. However, compared to Captain Lind’s last contact at 0:01 when he requested to lower the altitude to 1,000 meters and the speed of the plane, by 0: 20 minutes, the 2501 had passed out of Lake Michigan and is in Milwaukee airspace. The divers’ search during the following days was also fruitless, partly because the bottom of Lake Michogan was muddy, and the visibility was limited. In addition, many of the large objects detected by the sonar are not those of the 2501.

In July, a local fisherman, Wallace Chambers, pulled the net onto a small, distorted piece of metal. Analysis of the US Civil Aviation Commission led to suspicion that this piece of metal belonged to the 2501, but during World War II, the US military used more than 3,000 DC-4s and by the end of the war, nearly 600 the aircraft became a civil aircraft with identical construction, so the wreckage recovered by Wallace Chambers said nothing.

Six months after the disappearance of Flight 2501, after thoroughly analyzing all the collected specimens, the US Civil Aviation Commission officially concluded this was a “catastrophe without any cause”.

From there, over time, the incident sank into oblivion until science invented advanced detectors, which could restore the model of the seabed, river, lake, with all the details in on the bottom the search for the 2501 begins to restart.

DRAW HIGH