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Lead Boat: SS-172, U.S.S. Porpoise
Length: 301′
Beam: 24′ 11″
Draft: 13′ 10″ (Surface trim)
Displacement: 1,300 tons (surfaced); 1,900 tons (submerged)
Speed: 20 knots (surfaced); 9 knots (submerged)
Diving Depth: 250′ (test depth)
Range: 22,000 miles
Crew: 5 officers, 49 enlisted
Deck Gun: 1-3″/50-calibre
Anti-Aircraft Weapons:
Light Weaponry: 50 & 30 calibre machine guns
Torpedoes: 4-21″ torpedo tubes (bow), 2-21″ torpedo tubes (stern), 16 torpedoes
Engines: 4-1,300 hp main diesels, 3-100 kw auxiliaries
Motors: 4-521 hp


Hull NumberNameCommission DateFateClass
SS-172Porpoise1935Scrapped 1957Porpoise-Class
SS-173Pike1935Scrapped 1957Porpoise-Class
SS-174Shark1936Lost March 1942Porpoise-Class
SS-175Tarpon1936Sold 1957, foundered on tow to breakersPorpoise-Class
SS-176Perch1936Lost March 1942Porpoise-Class
SS-177Pickerel1937Lost August 1943Porpoise-Class
SS-178Permit1937Scrapped 1958Porpoise-Class
SS-179Plunger1936Scrapped 1957Porpoise-Class
SS-180Pollack1937Scrapped 1947Porpoise-Class
SS-181Pompano1937Lost January 1944Porpoise-Class