The breaking waves created in the shallow waters of the Barents Sea generate background signals, so that when two submarines approach one another head-on, each detects the other when the distance between the two vessels is just a couple of hundred meters. To reacquire the target, Grayling sped to the location of contact loss at 8–15 knots (15–28 km/h). Grayling lost contact with Novomoskovsk when the Russian submarine changed course to 180 degrees. Īn investigation revealed that Grayling had been tracking the Russian submarine bearing between 155 and 165 degrees and from distances of between 11–13 kilometres (5.9–7.0 nmi). Before clearing the area, Grayling checked that the Russian submarine had not sustained serious damage. Immediately after, their sonar detected noises of a foreign submarine close by. 25 minutes later, while submerged at 74 meters, the crew of Novomoskovsk felt an impact, then heard screeching noises. Having reached the northern border of the designated area, she turned back, making between 16 knots (30 km/h) to 18 knots (33 km/h). Novomoskovsk, commanded by Captain First Rank Andrei Bulgarkov, was performing combat training tasks at a site 105 nautical miles (194 km) north of Murmansk. Navy decommissioned 14 of the first 31 ships in the Los Angeles class instead of refueling them, most at between 17 and 19 years of service. This was not unusual as part of post-Cold War restructuring, the U.S. Īccording to some sources, Baton Rouge was written off for the high costs of repairing the damaged pressure hull, along with a programmed refueling. The American press claimed that the submarine was checking wireless traffic between Russian bases, but the Russians and independent sources asserted that the two units were engaged in a 'cat-and-mouse game'. The mission of Baton Rouge was reportedly the recovery or delivery of intelligence-monitoring devices on the seabed. On 11 February 1992, the American attack submarine USS Baton Rouge collided with the Russian Navy nuclear submarine B-276 Kostroma off Severomorsk. The intelligence-gathering included the tapping of Soviet submarine communication cables, the recording of the pattern of noises from Soviet submarines, and the observation of submarine-launched ballistic missile tests. This kind of submarine surveillance was officially known as "Operation Holy Stone" and "Operation Pinnacle" or "Bollard" in the submariners' jargon. Main article: Submarine incident off Kildin Islandĭespite the end of the Cold War and 1991 fall of the Soviet Union, the United States government tasked the US Navy to continue to keep a close watch on the main bases of Russian nuclear submarines to monitor developments, especially those related to strategic assets that remained under Russian control.
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