Unterseeboot 18
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Unterseeboot 18 or U-18 has been the name of several German submarines or U-boats during the First World War, the Second World War and in the post-war Bundesmarine.
- Unterseeboot 18 (1912) was a submarine built in 1912 for service in the First World War, and sunk in 1914.
- During the First World War, Germany also possessed the submarines:
- Unterseeboot 18 (1936) was a submarine built in 1936, and scuttled in 1944 during the Second World War.
- Unterseeboot 18 (S197) is a Type 206 submarine of the Bundesmarine, built in 1973, and still in service.