United States Navy modified XXI U-boat!
firefox108 (Premium member) > albums > The U-Boat Chronicles Album No.3
Album Info:
1945 wars-end. The United States Navy took two Type XXI's and a handful of Japanese boats for study, and applied some lessons - learned to a fleet upgrade dubbed "Greater Underwater Propulsive Power" (GUPPY). Note the extension to the original conning tower.
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