K-329 Severodvinsk is a Yasen-class nuclear attack submarine of the Russian Navy. The construction of the submarine started in 1993 and was first planned to be launched in 1998. However budgetary problems delayed the construction for years, and she was only launched on 15 June 2010. Severodvinsk began sea trials on 12 September 2011. The submarine returned from her first voyage by 6 October 2011.