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The Submarine Incident off Kildin Island was a collision between the US Navy nuclear submarine and the Russian Navy nuclear submarine B-276 Kostroma near the Russia n naval base of Severomorsk , on 11 February 1992 .
 US Navy, Russian Navy, Russia, Severomorsk
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 US Navy, Russian Navy, Russia, Severomorsk