Alternative Titles:Obras Incríveis do Nazismo, Obras Incríveis do Nazistas, 纳粹二战工程:美国之战, Mega-Projekte der Nazis, Nazi Megakonstuktioner, Nazi Mega Weapons, Nazi Megastructures: America's War
Overview: This episode describes the immense and impenetrable concrete and steel submarine pens that the Nazis built to protect their precious and deadly U-boats from Allied attacks.
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First Air Date: Nov 18, 2013Last Air date: Dec 18, 2019Season: 6 SeasonEpisode: 36 EpisodeRuntime: 45 minutesQuality: HDIMDb: 7.50 / 10 by 21 usersPopularity: 22.615Language: English