Unterseeboot 23

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Unterseeboot 23 or U-23 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 23 (1913) was a submarine built in 1913 for service in the First World War, and sunk in 1915.
  • During the First World War, Germany also possessed the submarines:
    • Unterseeboot B-23, built in 1916 and interned in 1917.
    • Unterseeboot C-23, built in 1916 and surrendered in 1918.

• Unterseeboot 23 (1936) was a submarine built in 1936, and scuttled in 1944.

• Unterseeboot 23 (S172) is a Type 206 submarine of the Bundesmarine, built in 1975, and still in service.