Unterseeboot 73
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Unterseeboot 73 or U-73 has been the name of several German submarines or U-boats during the First World War and the Second World War.
- Unterseeboot 73 (1915) was built in 1915 and operated in the First Battle of the Atlantic during the First World War before being scuttled in 1918.
- Unterseeboot 73 (1940) was built in 1940 and operated during the Second Battle of the Atlantic during the Second World War before being sunk in 1943.