USS Segundo (SS-398)

History
United States
Name:	Segundo
Builder:	Portsmouth Naval Shipyard, Kittery, Maine
Laid down:	14 October 1943
Launched:	5 February 1944
Commissioned:	9 May 1944
Decommissioned:	1 August 1970
Struck:	8 August 1970
Fate:	Sunk as a target, 8 August 1970
General characteristics
Class and type:	Balao-class diesel-electric submarine
Displacement:	1,526 tons (1,550 t) surfaced 2,391 tons (2,429 t) submerged
Length:	311 ft 6 in (94.95 m)
Beam:	27 ft 3 in (8.31 m)
Draft:	16 ft 10 in (5.13 m) maximum
Propulsion:	4 × Fairbanks-Morse Model 38D8-⅛ 10-cylinder opposed piston diesel engines driving electrical generators 2 × 126-cell Sargo batteries 4 × high-speed Elliott electric motors with reduction gears two propellers 5,400 shp (4.0 MW) surfaced 2,740 shp (2.0 MW) submerged
Speed:	20.25 knots (38 km/h) surfaced 8.75 knots (16 km/h) submerged
Range:	11,000 nautical miles (20,000 km) surfaced at 10 knots (19 km/h)
Endurance:	48 hours at 2 knots (3.7 km/h) submerged 75 days on patrol
Test depth:	400 ft (120 m)
Complement:	10 officers, 70–71 enlisted
Armament:	10 × 21-inch (533 mm) torpedo tubes 6 forward, 4 aft 24 torpedoes 1 × 5-inch (127 mm) / 25 caliber deck gun Bofors 40 mm and Oerlikon 20 mm cannon

USS Segundo (SS-398) was a Balao-class submarine, of the United States Navy named for the segundo, a fish of Caribbean waters.

Segundo was laid down on 14 October 1943 by the Portsmouth Navy Yard in Kittery, Maine; launched on 5 February 1944; sponsored by Mrs. John L. Sullivan; and commissioned on 9 May 1944, Lieutenant Commander James D. Fulp, Jr., in command.

Segundo completed fitting out and contract trials then moved to New London, Connecticut, on 15 June and began training. The submarine stood out of New London on 26 June for the Panama Canal Zone en route to the Pacific war zone. She departed Balboa on 9 July and arrived at Pearl Harbor on 25 July. The next several weeks were spent in training exercises and weapons firing. The ship was combat loaded on 19 August and 20 August and, the next day, sailed on her first war patrol.

Segundo, together with submarines Seahorse, and Whale formed a wolf pack. They refueled at Saipan on 3 September and departed the next day for their patrol area in the Philippines near Surigao Strait. No worthwhile targets were found, and Segundo ended her patrol at Majuro Atoll, Marshall Islands, on 21 October without having fired a shot.

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