Secret Nazi Bases - Season 1 Episode 6 -
Hitler's Invisible City (Dag Bromberg)
As the Red Army approaches a forest in Poland at the end of the war, they stumble upon a massive complex containing over a thousand structures across 25 sq km. How did the Germans keep this colossal base secret from allied intelligence?
Please explain the problem in a few words.
Max 255 characters.
Max 255 characters.