[Onkel Neal]

One of the best articles I've read on the Alfa. This came out in 2014.

Developed in the ‘60s at the height of the Cold War, it remains the fastest of its kind till this very day. Its propulsion system was so powerful that it required an overhaul after a single high-speed mission. It could operate at unrivaled elevations, was ridiculously expensive to operate and its very existence sent the US into a frenzy trying to counter it.

The Alfa Class had a double hull design, with the inner hull handling the enormous pressures that would be faced by the sub’s extreme operating depths (stated at over 2200 feet, with some sources putting its crush-depth at over 3600 feet!), and a lighter outer hull that is optimized for speed, maneuverability and acoustic stealth. For its high strength and low weight, the Alfa’s hulls were made out of massive amounts of titanium.