SM U-23 (Austria-Hungary)

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 Königliche Kriegsmarine or K.u.K. Kriegsmarine) during the First World War. The design for U-23 was based on that of the submarines of the Royal Danish Navy's Havmanden class (which had been designed by Whitehead & Co. in Fiume), and was largely obsolete by the beginning of the war.

SM U-23 (Austria-Hungary)

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 Königliche Kriegsmarine or K.u.K. Kriegsmarine) during the First World War. The design for U-23 was based on that of the submarines of the Royal Danish Navy's Havmanden class (which had been designed by Whitehead & Co. in Fiume), and was largely obsolete by the beginning of the war.