From Sebastien Roblin, The National Interest: “Intelligence provided by the spies John Walker and Jerry Whitworth in the 1970s convinced the Soviet Navy that it needed to seriously pursue acoustic stealth in its next attack submarine. After the prolific Victor class and expensive titanium-hulled Sierra class, construction of the first Project 971 submarine, Akula (“Shark”), began in 1983. The new design benefited from advanced milling tools and computer controls imported from Japan and Sweden, respectively, allowing Soviet engineers to fashion quiet seven-bladed propellers.”
U.S., RUSSIA: Why the U.S. Navy Fears Russia's Akula-Class Submarines
From Sebastien Roblin, The National Interest: “Intelligence provided by the spies John Walker and Jerry Whitworth in the 1970s convinced the Soviet Navy that it needed to seriously pursue acoustic stealth in its next attack submarine. After the prolific Victor class and expensive titanium-hulled Sierra class, construction of the first Project 971 submarine, Akula (“Shark”), began in 1983. The new design benefited from advanced milling tools and computer controls imported from Japan and Sweden, respectively, allowing Soviet engineers to fashion quiet seven-bladed propellers.”
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