Scorpion is one of the Soviet-designated "Project 641" (and NATO-designated "Foxtrot") class of submarines manufactured between 1957 and 1983 at shipyards in Leningrad (today's St. Petersburg, Russia). These were among the largest and most lethal non-nuclear-powered submarines ever built. Fifty-eight Foxtrot-class vessels were originally built for the Soviet Navy, with an additional seven built for the Indian Navy, six for the Libyan Navy, and six for the Cuban Navy. Military researchers believe that Soviet Foxtrot-class subs participated in naval operations related to the Cuban Missile Crisis in October 1962.
Each Foxtrot-class sub could be propelled for up to 5 days by electric motors powered by a large bank of batteries found beneath the main interior deck. The sub was fitted with three diesel engines for recharging the batteries. To run the diesels (and expel their exhaust gases), the sub would travel near the ocean's surface and extend a snorkel tube into the fresh air.
Information from; Paul K. Sholar LA Unique Travel Examiner
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