Delta-class submarine

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What Wikipedia says

The Delta class, (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) are a family of nuclear-powered ballistic missile submarines, designed and built in the Soviet Union, which formed the backbone of the Soviet and Russian strategic submarine fleet since their introduction in 1973.

Excerpt from the Wikipedia article “Delta-class submarine”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Mike1979 Russia, CC BY-SA 3.0, via Wikimedia Commons.