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O-12 (SS-73) was discarded in 1930 to be rebuilt by Lake & Danenhower Inc., of Bridgeport CT., for the Wilkins Artic expedition. Lake had long thought about submarine operations under ice; in 1903, he built a trestle atop his Protector and deliberately operated her in iced waters. The Nautilus conversion, shown here, was far more sophisticated. Drawing by Jim Christley, text courtesy of U.S. Submarines Through 1945, An Illustrated Design History by Norman Friedman. Naval Institute Press. Via Navsource
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