![]() S-1, S-2, and S-3 were prototypes built to the same specification: S-1 designed by Electric Boat, S-2 by Lake, and S-3 by the Bureau of Construction and Repair (BuC&R) (later Bureau of Ships). S-2 was a prototype built by Lake, and was not repeated. Group IV ( S-48 class, or "2nd Navy Yard" type): 4 boats, S-48 to S-51, built by Lake.Group III ( S-42 class, or "2nd Holland" type): 6 boats, S-42 to S-47, built at Fore River.Group II ( S-3 class, or "Navy Yard" type): 15 boats, S-3 to S-17, built at the Portsmouth Navy Yard and Lake Torpedo Boat at Bridgeport, Connecticut.Group I ( S-1 class, or "Holland" type): 25 boats, S-1 and S-18 to S-41, built by Bethlehem Steel at Fore River Shipyard in Quincy, Massachusetts and Union Iron Works in San Francisco, California, as subcontractors for the designer, the Electric Boat Company.The S class is subdivided into four groups of different designs: The last of the class actually commissioned was USS S-47 (SS-158) in 1925. The United States Navy commissioned 51 S-Class submarines from 1920 to 1925. Others of this class were built to contractor designs. The United States' S-class submarines, often simply called S-boats (sometimes "Sugar" boats, after the then contemporary Navy phonetic alphabet for "S"), were the first class of submarines with a significant number built to United States Navy designs.
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