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In page Alfa-class submarine:

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The Alfas were intended to be only the first of a new generation of light, fast submarines, and before their decommissioning, there was already a family of derivative designs, including Project 705D, armed with long-range 650 mm torpedoes, and the Project 705A ballistic missile variant that was intended be able to defend herself successfully against attack submarines, therefore not needing patrolled bastions. However, the main thrust of Russian/Soviet SSN development was instead focused toward the larger, quieter boats that eventually became the Akula-class submarine.[citation needed]