United States C-class submarine
 The C class submarines were five United States Navy submarines built by the Fore River Shipbuilding Company in Quincy Massachusetts under a subcontract from the Electric Boat Company. Built between 1906–1909 and in commission from 1908–1919 all five were subsequently sold for scrap in 1920. They were considerably larger than the preceding B-class at 275 tons submerged vs. 173 tons submerged and were the first US submarines with two-shaft propulsion doubling the machinery of the B-class.