Unterseeboot 54
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Unterseeboot 54 or U-54 has been the name of several German submarines or U-boats during the First World War and the Second World War.
- Unterseeboot 54 (1916) was a submarine built in 1916 for service in the First World War, and surrendered in 1918.
- Unterseeboot 54 (1939) was a submarine built in 1939, and missing since 1940.

