Unterseeboot 66
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Unterseeboot 66 or U-66 has been the name of several German submarines or U-boats during the First World War and the Second World War.
- Unterseeboot 66 (1915) was built in 1915 and operated in the First Battle of the Atlantic during the First World War before being sunk in 1917.
- Unterseeboot 66 (1941) was built in 1941 and operated during the Second Battle of the Atlantic during the Second World War before being sunk in 1944.