SM U-12 (Austria-Hungary)

SM U-12 or U-XII was a U-5-class submarine or U-boat built for and operated by the Austro-Hungarian Navy before and during the First World War. Built on speculation by Whitehead & Co. of Fiume, the submarine was launched as SS-3 in March 1911 and featured improvements in the electrical and mechanical systems from the design by the American John Philip Holland, to which her older sister boats, SM U-5 and U-6, had been built.

SM U-12 (Austria-Hungary)

SM U-12 or U-XII was a U-5-class submarine or U-boat built for and operated by the Austro-Hungarian Navy before and during the First World War. Built on speculation by Whitehead & Co. of Fiume, the submarine was launched as SS-3 in March 1911 and featured improvements in the electrical and mechanical systems from the design by the American John Philip Holland, to which her older sister boats, SM U-5 and U-6, had been built.