Unterseeboot 20
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Unterseeboot 20 or U-20 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 20 (1912) was a submarine built in 1912 for service in the First World War, and grounded and blown up in 1916. This U-Boat sunk the passenger ship Lusitania.
- Unterseeboot 20 (1936) was a submarine built in 1936, and scuttled in 1944 during the Second World War.
- Unterseeboot 20 (S199) is a Type 206 submarine of the Bundesmarine, built in 1974, and scrapped in 1996 and sold to Indonesia.