![]() The German-made submarine was reported missing on April 21. Photo released by the Indonesian Navy shows parts of submarine KRI Nanggala on the ocean floor. At 800m, Nanggala had no chance of surviving intact. But the risk of hull collapse increases very rapidly as depth increases. What is known as the “crush depth” will be much more than that. Submarines such as Nanggala have an individual safe operating depth of at least 260m. There is no hard and fast figure for the exact depth at which this occurs. Regardless of the trigger, the tragic fate of KRI Nanggala would have been sealed once it passed the depth at which its hull and fittings could not withstand the increasing pressure. Material failure is the more likely cause. Submariners, however, have very carefully developed and extensively drilled standard operating procedures. There could have been a fire, something particularly feared by submariners in their enclosed environment. It does not take much loss of buoyancy for a submarine to lose control of its depth. Causes could include a material or mechanical failure leading to catastrophic flooding of one or more compartments. So whatever went wrong likely did so as the submarine was diving.Īt this stage, it is impossible to know what triggered the incident. Nanggala’s discovery so early in the search suggests the boat was near its last reported position. It took one year to find Argentinian submarine San Juan after it sank in 2017. ![]() The other pictures may show sections of the interior, but it’s not immediately entirely clear exactly what part of the boat they are.Īn image of the wreckage made available by the Indonesian Navy. ![]() This image made available by the Indonesian Navy of the sunk navy submarine KRI Nanggala appears to show one of the fins mounted on the boat’s stern. ![]() The Indonesian Navy (TNI-AL) has released video footage, taken by a remotely operated underwater vehicle belonging to the Singaporean Navy, which appears to show one of the fins mounted on the boat’s stern. Initial examination of the sunken vessel suggests the wreckage is in three pieces, with the boat’s hull and stern separated. With no survivors from the 53-person crew-and no certainty the cause of disaster will ever be confirmed-the Indonesian Navy will need to decide how much effort it devotes to examining and salvaging the wreckage. After a five-day search, wreckage from Indonesia’s missing submarine KRI Nanggala has been discovered at a depth of more than 800 meters in the Bali Sea. ![]()
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