In this detailed lecture, we explore the Soviet Navy’s formidable Delta III-class ballistic missile submarines (Project 667BDR “Kalmar”). This in-depth presentation breaks down every system onboard—sonar suites, navigation systems, propulsion layout, ballistic missile capabilities, and more.We’ll examine each submarine in the class individually, highlighting their operational history, patrol routes, and notable interactions with NATO maritime forces during the Cold War. From the Barents Sea to the Pacific, the Delta III SSBNs played a critical role in maintaining Soviet second-strike capability.Whether you’re a naval enthusiast, Cold War historian, or submarine tech buff, this lecture offers a comprehensive review of one of the most important Soviet strategic assets of the late 20th century.