On may 4, 1945 one of the most advanced submarines in the world crept up to a british royal navy cruiser She was the first real combat submarine that was meant to dwell in the deep and not just retreat to it once in danger These boats had much better crew facilities than previous classes, much more silent underwater, freezer for foodstuffs, a shower and a basin and little things like that. Germans rushed the technological marvel into production late in the war. With the type xxi, for the first time, germany made a decisive step from a “submersible” to a “submarine” The philosophy that prevailed since 1905 was that a “submersible” was essentially a torpedo boat that submerge at times, for all emergency.
Due to their powerful electrical engines and hydrodynamical shaped hull, those very advanced submarines were faster submerged than on the surface.
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