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The story of Nazi engineers tasked with fulfilling Hitler's megalomaniac demand for the construction of a land battleship weighing 1,000 tons.
To create a safe haven in port for their lethal U-boat submarines, the Nazis built massive, impenetrable submarine pens that still survive today.
Explore the story behind one of the most advanced aeroplanes of WWII, the Messerschmitt Me 262, and the subterranean bat-cave where it was built.