USS Grampus (SS-207)

History
United States
Builder	Electric Boat Company, Groton, Connecticut
Laid down	14 February 1940
Launched	23 December 1940
Commissioned	23 May 1941
Stricken	21 June 1943
Fate	Possibly sunk by Japanese destroyers in Blackett Strait, 5 March 1943
General characteristics
Class & type	Tambor-class diesel-electric submarine
Displacement	1,475 long tons (1,499 t) standard, surfaced; 2,370 tons (2,408 t) submerged;
Length	307 ft 2 in (93.62 m)
Beam	27 ft 3 in (8.31 m)
Draft	14 ft 7+1⁄2 in (4.458 m)
Propulsion	4 × General Motors Model 16-248 V16 Diesel engines driving electric generators; 2 × 126-cell Sargo batteries; 4 × high-speed General Electric electric motors with reduction gears; two propellers ; 5,400 shp (4.0 MW) surfaced; 2,740 shp (2.0 MW) submerged;
Speed	20.4 knots (38 km/h) surfaced; 8.75 knots (16 km/h) submerged;
Range	11,000 nautical miles (20,000 km) at 10 knots (19 km/h)
Endurance	48 hours at 2 knots (3.7 km/h) submerged
Test depth	250 ft (76 m)
Complement	6 officers, 54 enlisted
Armament	10 × 21-inch (533 mm) torpedo tubes; 6 forward, 4 aft; 24 torpedoes; 1 × 3-inch (76 mm) / 50 caliber deck gun; Bofors 40 mm and Oerlikon 20 mm cannon;

USS Grampus (SS-207) was the eighth Tambor-class submarine to be commissioned in the United States Navy in the years leading up to the country's December 1941 entry into World War II. She was the sixth ship of the United States Navy to be named for Grampus griseus, also known as Risso's dolphin, a member of the dolphin family Delphinidae. Her World War II service was in the Pacific Ocean. She completed five war patrols in the following 14 months, and is credited with sinking over 45,000 tons of Japanese merchant shipping and warships. She was declared lost with all hands in March 1943; of the twelve Tambor-class submarines, only five survived the war. She received three battle stars for her World War II service.