Unterseeboot 99
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Unterseeboot 99 or U-99 has been the name of several German submarines or U-boats during the First World War and the Second World War.
- Unterseeboot 99 (1917) was built in 1917 and operated in the First Battle of the Atlantic during the First World War before being sunk in 1917.
- Unterseeboot 99 (1940) was built in 1940 and operated in the Second Battle of the Atlantic during the Second World War before being sunk in 1941.