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Ostrovnoy (Russian: Островно́й), previously known as Murmansk-140 (Му́рманск-140), is a closed town in Murmansk Oblast, Russia. As of the 2010 Census, its population was 2,171.
The first naval base was established here in 1915. There is no rail link to Ostrovnoy and the settlement is reachable by coastal ship, helicopter or small plane in winter. Until 1938, the town was known as Yokanga. Until 1981, the town was known as Gremikha. The Gremikha Naval Base was one of the Northern Fleet's main facilities for servicing nuclear submarines.
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