the submarine was twisted, bent and crumpled, and water had entered the forward compartment. Another submarine, , also sustained minor damage when the fire on Sindhurakshak caused its torpedoes to explode. An enquiry into the incident found the cause of the incident to be violation of Standard Operating Procedures during torpedo loading. This resulted in the explosion of two torpedoes during the incident while the remaining 14 torpedoes disintegrated. Initially, the navy was hopeful of using Sindhurakshak after it was salvaged, but on Navy Day 2015, Vice Admiral Cheema confirmed the Sindhurakshak would be disposed of. After a period of use for the training of marine commandos, the submarine was sunk in 3000 metres of water in the Arabian Sea during June 2017. Russian K-150 Tomsk fire On 16 September 2013, fifteen seamen were hospitalized after a fire on the Oscar-class submarine. The fire started during welding activity, as the sub was being repaired at the Zvezda shipyard near Vladivostok on the Sea of Japan. The fire was put out after five hours. A federal Investigative Committee said the fire had "caused damage to the health of 15 servicemen" and they remained in hospital. It gave no details about their condition. USS Jacksonville collision On 10 January 2013, struck an unidentified vessel in the Persian Gulf and bent one of its periscopes. The ship's commanding and executive officers were relieved for cause following the incident. The ship was later identified as a fishing trawler. 2015 HMS Talent collision In early 2015 entered Devonport Naval base in Plymouth with significant damage to its sail after striking ice. 2016 Sinking of unknown North Korean submarine On March 11, 2016, CNN and the U.S. Naval Institute News reported that unnamed US officials believed a North Korean submarine had been lost at sea in the Sea of Japan. According to reports, the U.S. military had been observing the submarine when it "stopped" before the North Korean navy was observed searching the area by American satellites, aircraft and ships. HMS Ambush collision On 20 July 2016, while operating at periscope depth on a training exercise in the Strait of Gibraltar, collided with a merchant ship, sustaining significant damage to the top of her conning tower. The merchant vessel did not sustain any damage. It was reported that no crew members were injured during the collision and that the submarine's nuclear reactor section remained completely undamaged.