BS-64 is a Project 667BDRM Delfin-class ballistic missile submarine (NATO reporting name "Delta-IV") of the Russian Navy. She was originally designated K-64.K-64 was removed from active service in 1999 and was ordered to be refitted. It was planned for her to be reactivated in 2002 to replace the Yankee 'Stretch' class KS-411.