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In the second of this two-part series, David Hayman explores Germany's World War One U-boat threat and the fascinating and dastardly ploys Britain used against the submarines.
First Air Date : Apr 07, 2015
Last Air date : Apr 14, 2015
Episode : 2 Episode
Season : 1 Season
Runtime: 60 minutes
Studio: BBC Two
Country: Germany, United Kingdom
Cast: David Hayman