December 26, 201213 yr Gotland class submarine http://en.wikipedia.org/wiki/Gotland_class_submarine "The Gotland class submarines of the Swedish Navy are modern diesel-electric submarines, which were designed and built by the Kockums shipyard in Sweden. They are the first submarines in the world to feature a Stirling engine air-independent propulsion (AIP) system, which extends their underwater endurance from a few days to weeks.[2] This capability had previously only been available with nuclear powered submarines." --Wikipedia ANW HUD-4 v1.11
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