The War at Sea: The Battle of the U-Boats
BBC Worldwide Learning
In April 1917, German U-Boats were sinking a dozen British ships every day. The First Sea Lord John Jellicoe,warned that Britain might not be able to carry on fighting into 1918. In the second of this two-part series, David Hayman explores Germany's World War I U-Boat threat, and the fascinating and dastardly ploys Britain used against the submarines.