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https://www.facebook.com/interestingengineering/videos/662395635773083/?mibextid=rS40aB7S9Ucbxw6v https://en.wikipedia.org/wiki/Gotland-class_submarine Deisel/ electric submarines need to surface for air every few days.One of the supposed advantages of nuclear submarines is they can stay submerged for weeks or months without needing to surface for air. The Gotland class of submarines from the Kockums shipyard in Sweden are the first to be powered by sterling engines ... Read more