Russia’s Alfa course fast attack submarine was the SR-71 of the undersea world during the Cold War. The Alfas were largely constructed of titanium,used a liquid-metal cooled nuclear powerplant to obtain extreme speeds, and could reach depths far deeper than their competitors. Now Russia is floating the concept of building a modernized version of the design, and one that leverages 40 years in technological advancement to take combat submarine automation to a whole recent level.
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Source: jalopnik.com