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SM "U-5 or U-V" was the lead boat of the "U-5" class of submarines or U-boats built for and operated by the Austro-Hungarian Navy () before and during the First World War. The submarine was built as part of a plan to evaluate foreign submarine designs, and was the first of three boats of the class built by Whitehead &amp; Co. of Fiume after a design by Irishman John Philip Holland.