Russian submarine K-550 Alexander Nevskiy is a Russian nuclear ballistic missle submarine of the fourth generation Borei class (Project 955A) in sea-trials. Named after the Russian saint Alexander Nevskiy, the submarine was laid down in March 2004 and was first planned to be launched in 2009. However budgetary problems and repeated failures of the submarines main weapon, the Bulava SLBM missile, has pushed the launch date forward. Russian officials have however claimed that the submarine has been completed on time and even ahead of schedule. The submarine was to have been rolled out from its construction hall on 30 November 2010. This was postponed to December due to bad weather, according to the shipyard's press service.

On 2 December 2010 the submarine was rolled out from its construction hall to floating dock and would be launched at an unknown future date. The submarine was inspected by the Russian Prime minister, Vladimir Putin on 13 December 2010.

With an estimated cost of 23 billion RUR (~$900 million USD), the new submarine has no significant differences from the lead ship, SSBN Yury Dolgoruky.

On 24 October 2011 the submarine started its sea trials. It's planned to launch the first SLBM from the Alexander Nevsky in 2012. The submarine is expected to enter service in the summer of 2012.

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