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Learn more: http://to.pbs.org/2gWGnWV The Nazis grasp on a small corner of Britain, the Channel Islands, becomes an obsession for Hitler, as he turns them into one of the most heavily fortified places on the planet – his island megafortress. Premieres April 11 8/7c Subscribe to the PBS channel for more clips: https://www.youtube.com/user/PBS/featured Enjoy full episodes of your favorite PBS programs at pbs.org/video. Like PBS on Facebook: https://www.facebook.com/pbs/ Follow PBS on Twitter: https://twitter.com/PBS Follow PBS on Instagram: https://www.instagram.com/PBS Official website: http://www.pbs.org/ Get PBS merchandise: http://www.shoppbs.org/home/index.jsp Nazi Mega Weapons and WWII Mega Weapons uncover the engineering feats that sparked a technological revolution and changed warfare forever.