Delta class
Delta class may refer to: Delta-class submarine (Russian: Дельта) Soviet designations Project 667B "Murena", Project 667BD "Murena-M", Project 667BDR "Kalmar", Project 667BDRM "Delfin"; NATO reporting names Delta I, Delta II, Delta III, Delta IV respectively), a series of third generation nuclear-powered ballistic missile submarines of the Soviet Navy.