Unterseeboot 40

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Unterseeboot 40 or U-40 has been the name of several German submarines or U-boats during the First World War and the Second World War.

• The first Unterseeboot 40, a submarine, served with the Kaiserliche Marine during the First World War, participating in the First Battle of the Atlantic.
  • During the First World War, Germany also possessed the submarines:
    • Unterseeboot B-40, built in 1916 and scuttled in 1918.
    • Unterseeboot C-40, built in 1916 and sunk in 1919.

• The second Unterseeboot 40, a submarine, served with the Kriegsmarine during the Second World War, participating in the Second Battle of the Atlantic.