A U-boat or Unterseeboot was a submarine used by Germany in both world wars.
During the Great War, a U-boat was responsible for the sinking of the British passenger liner Lusitania. After the war, U-boat construction was blocked by the Treaty of Versailles preventing Germany rebuilding a military.
However, designs for submarines began to be developed in secret in 1922 by the Submarine Development Bureau and by 1935, Adolf Hitler had denounced and ignored the treaty, and U-boats were in use up to and during World War II.
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