"So the only system they have is to get to the surface and abandon the submarine on the surface or if they're in water that is less than 180 metres in depth they could put a special suit on so they can breathe and not burst their lungs and they can get to the surface," Owen told The Sydney Morning Herald. He said the Indonesian sub was not fitted with a special hatch seal that would allow the crew to escape into a different vessel during an underwater rescue. Built to hunt and destroy hostile enemy submarines, Thresher was the quietest and fastest submarine of her time. ![]() So they can survive at that depth, but not necessarily operate." The Navy would eventually establish that Thresher and her crew were lost on Aponce the boat descended below crush depth, due to uncontrolled flooding, and imploded under the devastating pressures of the ocean. ![]() "They can go deeper than that because they will have a safety margin built into the design, but the pumps and other systems that are associated with that may not have the capacity to operate. Submarines are generally designed with an operating depth of 2,000-2,500 feet (610-762 m) with a maximum or crush depth of around 3-4 times the operating depth. "Most rescue systems are really only rated to about 600 meters (1,969 feet)," he told the AP. If the vessel is intact, it could be too deep for a rescue, said Frank Owen, secretary of the Submarine Institute of Australia. "Anything more than that can be pretty fatal, dangerous," he said.Ī Daewoo Shipbuilding official, Ahn Guk-hyeon, told the AP that the submarine would collapse if it goes deeper than about 200 meters (about 655 feet). Navy spokesman Julius Widjojono told Indonesia's KompasTV earlier that the boat could sustain a depth of 250-500 meters (about 820-1,640 feet). Speaking to reporters, the navy chief of staff said the submarine had "received a letter of feasibility from the navy" and that "it was ready for battle." The test depth is set at two-thirds (0.66) of the design depth for United States Navy submarines, while the Royal Navy sets test depth at 4/7 (0.57) the design. A Daewoo official told The Associated Press that the company had upgraded the boat's internal structures and systems. Photo released by the Indonesian Navy shows parts of submarine KRI. The official top speed of the submarines while submerged is over 25 knots, although the actual maximum is classified. Named after the lead ship of the class, USS Gato, they were the first mass-production U.S. Hull length is 360.5 feet, beam width is 33 feet, and draft is 30.8 feet. At 800m, Nanggala had no chance of surviving intact. The Gato class of submarines were built for the United States Navy and launched in 19411943. ![]() Despite its age, a refit of the vessel by South Korea's Daewoo Shipbuilding and Marine Engineering was completed in 2012. But the risk of hull collapse increases very rapidly as depth increases. The German-built submarine has been in service since the early 1980s.
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