The Battle of the U-Boats

S1 E2: In April 1917, German U-Boats were sinking a dozen British ships every day. The First Sea Lord, Admiral Jellicoe, warned that Britain might not be able to carry on fighting into 1918 and World War I could be lost. Historian David Hayman explores Germany's U-Boat threat and the fascinating and dastardly ploys Britain used to sink the submarines and turn the tide of the Great War.