USS S-20

	USS S-20 (SS-125) S-20 and her snorkel are pictured here, offNew England, on 26 March 1945
History
United States
Name	S-20
Builder	Fore River Shipyard, Quincy, Massachusetts
Cost	$677,622.76 (hull and machinery)
Laid down	15 August 1918
Launched	9 June 1920
Sponsored by	Miss Anne Claggett Zell
Commissioned	22 November 1922
Decommissioned	16 July 1945
Stricken	25 July 1945
Identification	Hull symbol: SS-124; Call sign: NINJ; ;
Fate	Sold for scrapping, 22 January 1946
General characteristics
Class & type	S-18-class submarine
Displacement	930 long tons (945 t) surfaced; 1,094 long tons (1,112 t) submerged;
Length	219 feet 3 inches (66.83 m)
Beam	20 ft 8 in (6.30 m)
Draft	17 ft 3 in (5.26 m)
Installed power	1,200 brake horsepower (895 kW) diesel; 2,375 hp (1,771 kW) electric;
Propulsion	2 × NELSECO diesel engines; 2 × Ridgway Dynamo & Engine Company electric motors; 2 × 60-cell batteries; 2 × Propellers;
Speed	14.5 knots (26.9 km/h; 16.7 mph) surfaced; 11 kn (20 km/h; 13 mph) submerged;
Range	3,420 nmi (6,330 km; 3,940 mi) at 6.5 kn (12.0 km/h; 7.5 mph) surfaced; 8,950 nmi (16,580 km; 10,300 mi) at 9.5 kn (17.6 km/h; 10.9 mph) surfaced with fuel in main ballast tanks; 20 hours at 5 knots (9 km/h; 6 mph) submerged;
Test depth	200 ft (61 m)
Capacity	41,921 US gallons (158,690 L; 34,907 imp gal) fuel oil
Complement	4 officers ; 34 enlisted;
Armament	4 × 21-inch (533 mm) torpedo tubes (12 torpedoes); 1 × 4-inch (102 mm)/50-caliber;

USS S-20 (SS-125) was an S-18-class submarine, also referred to as an S-1-class or "Holland"-type, of the United States Navy, in commission from 1924 to 1945.

She served as an engineering experimental ship, starting in 1931, though she was modified in 1924, with a raised bow and external blisters to carry more fuel oil.

She saw duty in both the Atlantic and Pacific Oceans, and during World War II operated off New England.