High Quality Content by WIKIPEDIA articles SM U-23 or U-XXIII was a U-20-class submarine or U-boat built for and operated by the Austro-Hungarian Navy (German: Kaiserliche und K nigliche Kriegsmarine or K.u.K. Kriegsmarine) during the First World War. The design for U-23 was based on submarines of the Royal Danish Navy's Havmanden class (three of which had been built in Austria-Hungary), and was largely obsolete by the beginning of the war.
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