On may 4, 1945 one of the most advanced submarines in the world crept up to a british royal navy cruiser These submarines were the first submarines designed to operate primarily submerged, rather than spending most of their time on the surface and only submerging for brief. Electric boats), were the first submarines designed to operate primarily submerged, rather than as surface ships that could submerge as a means to escape detection or launch an attack The key improvement in the type xxi was greatly increased battery capacity, roughly triple the type viic This gave these boats great underwater range.
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