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{{short description|Balao-class submarine}}
{{Use American English|date=November 2024}}
{{Use dmy dates|date=November 2024}}
{|{{Infobox ship begin}}
{{Infobox ship image
|Ship image=USS Segundo (SS-398) underway at sea on 1 March 1966.jpg
|Ship caption=USS ''Segundo'' (SS-398) underway at sea on 1 March 1966.
}}
{{Infobox ship career
|Hide header=
|Ship country=United States
|Ship flag={{USN flag|1970}}
|Ship name=''Segundo''
|Ship ordered=
|Ship builder=[[Portsmouth Naval Shipyard]], [[Kittery, Maine]]<ref name="FriedmanSubs1-dates">{{cite book
| last = Friedman
| first = Norman
| authorlink =
| title = U.S. Submarines Through 1945: An Illustrated Design History
| publisher = [[United States Naval Institute]]
| year = 1995
| location = [[Annapolis, Maryland]]
| pages = 285–304
| url =
| doi =
| isbn = 1-55750-263-3 }}</ref>
|Ship laid down=14 October 1943<ref name="FriedmanSubs1-dates"/>
|Ship launched=5 February 1944<ref name="FriedmanSubs1-dates"/>
|Ship acquired=
|Ship commissioned=9 May 1944<ref name="FriedmanSubs1-dates"/>
|Ship decommissioned=1 August 1970<ref name="FriedmanSubs1-dates"/>
|Ship in service=
|Ship out of service=
|Ship struck=8 August 1970<ref name="FriedmanSubs1-dates"/>
|Ship reinstated=
|Ship fate=Sunk as a target, 8 August 1970<ref name="FriedmanSubs1-dates"/>
}}
{{Infobox ship characteristics
|Hide header=
|Header caption=
|Ship class={{sclass|Balao|submarine|0}} [[diesel-electric]] [[submarine]]<ref name="Register">{{cite book
| last = Bauer
| first = K. Jack
| authorlink =
|author2=Roberts, Stephen S.
| title = Register of Ships of the U.S. Navy, 1775–1990: Major Combatants
| publisher = Greenwood Press
| year = 1991
| location = [[Westport, Connecticut]]
| pages = 275–280
| url =
| doi =
| isbn = 0-313-26202-0 }}</ref>
|Ship displacement=*1,526 [[long ton|ton]]s (1,550 [[tonne|t]]) surfaced<ref name="Register"/>
*2,391 tons (2,429 t) submerged<ref name="Register"/>
|Ship length={{convert|311|ft|6|in|abbr=on}}<ref name="Register"/>
|Ship beam={{convert|27|ft|3|in|abbr=on}}<ref name="Register"/>
|Ship draft={{convert|16|ft|10|in|abbr=on}} maximum<ref name="Register"/>
|Ship propulsion={{Fleet-boat-propulsion-late-FM-4-E}}
|Ship speed=*{{convert|20.25|kn|km/h|0|lk=in}} surfaced<ref name="FriedmanSubs1-specs">''U.S. Submarines Through 1945'' pp. 305–311</ref>
*{{convert|8.75|kn|km/h|0}} submerged<ref name="FriedmanSubs1-specs"/>
|Ship range={{convert|11000|nmi|km}} surfaced at 10 knots (19 km/h)<ref name="FriedmanSubs1-specs"/>
|Ship endurance=*48 hours at {{convert|2|kn|km/h}} submerged<ref name="FriedmanSubs1-specs"/>
*75 days on patrol
|Ship test depth={{convert|400|ft|m|-1|abbr=on}}<ref name="FriedmanSubs1-specs"/>
|Ship complement=10 officers, 70–71 enlisted<ref name="FriedmanSubs1-specs"/>
|Ship sensors=
|Ship EW=
|Ship armament={{Fleet-boat-armament-5-inch}}
}}
|}

'''USS ''Segundo'' (SS-398)''' was a {{sclass|Balao|submarine}}, of the [[United States Navy]] named for the segundo, a [[Cavalla (disambiguation)|cavalla]] fish of [[Caribbean Sea|Caribbean]] waters.

==Construction and commissioning==
''Segundo'' was laid down on 14 October 1943 by the [[Portsmouth Navy Yard]] in [[Kittery, Maine|[Kittery]], [[Maine]], [[Ceremonial ship launching|launched]] on 5 February 1944, sponsored by Mrs. [[John L. Sullivan (U.S. Navy)|John L. Sullivan]], and [[Ship commissioning|commissioned]] on 9 May 1944.

==May–August 1944==
''Segundo'' completed [[Fitting-out|fitting out]] and contract [[Sea trials|trials]] then moved to [[Naval Submarine Base New London|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 Ocean theater of World War II|Pacific war zone]]. She departed [[Balboa, Panama|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.

== First and second patrols, August 1944 – January 1945 ==
''Segundo'', together with submarines {{USS|Seahorse|SS-304|2}}, and {{USS|Whale|SS-239|2}} formed a [[wolf pack (submarines)|wolf pack]]. They refueled at [[Saipan]] on 3 September and departed the next day for their patrol area in the [[Philippines]] near [[Surigao Strait]]. She was in the [[Philippine Sea]] {{convert|165|nmi}} east of [[Catanduanes Island]] at {{coord|13|32|N|126|55|E}} on 13 September 1944 when two U.S. Navy planes mistook her for a Japanese submarine and [[Strafing|strafed]] her as she [[Crash dive|crash-dived]]. No rounds struck her.<ref>Hinman & Campbell, p. 262.</ref> ''Segundo'' found no worthwhile targets were found during the patrol, and she ended it at [[Majuro Atoll]] in the [[Marshall Islands]] on 21 October 1944 without having fired a shot.

The second patrol, from 16 November 1944 to 5 January 1945, was more profitable. ''Segundo'', and [[Sister ship|sister boats]] {{USS|Trepang|SS-412|2}}, and {{USS|Razorback|SS-394|2}} were cruising between [[Luzon Strait]] and the [[South China Sea]]. On the evening of 6 December, a [[convoy]] of seven escorted merchant ships was sighted. The three submarines made night attacks which sank all of the merchantmen.

== Third patrol, February–March 1945 ==
''Segundo'' refitted at [[Guam]] from the [[submarine tender]] {{USS|Apollo|AS-25|2}} and was in the [[East China Sea]] with ''Razorback'' and {{USS|Sea Cat|SS-399|2}} on 1 February. Three [[torpedo]] attacks were made on unescorted ships near the [[Korea]]n coast in shallow water. The first attack was on 6 March against a small ship but all torpedoes missed. The next was made four days later against a medium-sized ship. Four torpedoes were fired at {{convert|1000|yd|m|-2}} but they also missed.

The third attack was a night surface action against a cargo ship on 11 March. Two torpedoes of the spread hit. The first blew the stern off and the second hit amidships, sinking cargo ship ''Shori Maru'' in two minutes. The submarine ended her patrol at Pearl Harbor on 26 March and remained there for a month before putting to sea again.

== Fourth and fifth patrols, May–August 1945 ==
''Segundo'' was assigned to a lifeguard station until 16 May when she departed for her assigned area in the East China Sea. On 29 May, she sank seven two-masted [[schooner]]s of approximately 100 tons each with shellfire. Two days later, she sank a large four-masted [[full-rigged ship]] of approximately 1,250 tons with two torpedoes. She sank another on 3 June with her deck gun. On 9 June, two patrol ships were also sunk by her deck gun. On the night of 11 June, ''Fukui Maru'' was torpedoed and sunk. The submarine then sailed to [[Midway Atoll]] for upkeep.

''Segundo'' began her fifth and final war patrol on 10 August in the [[Sea of Okhotsk]]. Ordered to proceed to [[Tokyo Bay]] on 24 August, the ship was proceeding south when she encountered the {{sclass|I-400|submarine|1}} {{ship|Japanese submarine|I-401||2}}, which was at the time the largest submarine in the world, by radar on 29 August. The enemy boat was ordered to halt by international signal. This was done; and, after several trips between the two submarines by their respective representatives, the Japanese agreed to accept a [[prize crew]] aboard and to proceed to Tokyo with ''Segundo''. The two ships entered [[Sagami Wan]] on 31 August and, at 05:00, the American flag was raised aboard ''I-401''.

== 1945–1953 ==
''Segundo'' stood out of Tokyo Bay on 3 September 1945 en route to the west coast via Pearl Harbor. She was assigned to [[Submarine Squadron 3|SubRon 3]] in [[San Diego]] and began operations from there. The submarine made a three-month cruise to [[Australia]] and [[China]] in 1946 and a four-month cruise to China in 1948.<ref>In April 1948, while visiting [[Brisbane, Queensland]], a team recruited from her crew played a softball match against a local "All Stars" team which they lost 10–3. ''Baseball'' in ''Semper Floreat'', 23 April 1948, Page 8c.</ref> The outbreak of the [[Korean War]] found ''Segundo'' in the Far East. She supported [[United Nations]] Forces in Korea from July to September 1950 before returning to San Diego in late November.

In 1951, ''Segundo'' was modernized and converted to a [[Fleet Snorkel]] submarine at the [[San Francisco Naval Shipyard|San Francisco Naval Shipyard]]. She returned to her home port and resumed operations until 15 August 1952 when she again joined the [[United States Seventh Fleet|7th Fleet]] off Korea. That deployment period ended on 16 February 1953.

== 1953–1970 ==
For the next 16 years, ''Segundo'' operated out of her home port and along the west coast. From 1953 through 1969, she was deployed to the western Pacific every year except 1961, and 1963.

''Segundo'' departed for the Western Pacific Ocean on 27 November 1956 with stops in Pearl Harbor, Yokosuka, Japan, Hong Kong, China, Subic Bay and Manila, Philippines and Buckner Bay, Okinawa.
The reason for this emergency departure was because of the Hungarian revolt that was taking place at the time. The Segundo was ordered into port in San Diego and shortly after departed for Peal Harbor, then the north Pacific on a special patrol, submerging on 21 December 1956 and resurfacing on 21 January 1957 before stopping in Yokosuka Japan.

In July 1970, a Survey Board found ''Segundo'' unfit for further naval service. The submarine was decommissioned 1 August 1970, struck from the [[Naval Vessel Register|Navy list]] on 8 August 1970, and sunk as a target by either the submarine {{USS|Salmon|SSR-573|2}} or the submarine {{USS|Sailfish|SSR-572|2}} (sources differ).

==Honors and awards==
''Segundo'' received four [[battle star]]s for [[World War II]] service and one for the [[Korean War]].

== References ==
===Citations===
{{reflist}}
{{refbegin}}
* {{DANFS|https://www.history.navy.mil/research/histories/ship-histories/danfs/s/segundo--ss-398-.html}}
{{refend}}
===Bibliography===
* [https://books.google.com/books?id=hkupDwAAQBAJ&dq=LApon+raton&pg=PA181 Hinman, Charles R., and Douglas E. Campbell. ''The Submarine Has No Friends: Friendly Fire Incidents Involving U.S. Submarines During World War II''. Syneca Research Group, Inc., 2019.] {{ISBN|978-0-359-76906-3}}.

== External links ==
* {{navsource|08/08398|Segundo}}

{{Balao class submarine}}
{{September 1944 shipwrecks}}
{{1970 shipwrecks}}

{{DEFAULTSORT:Segundo (SS-398)}}
[[Category:1944 ships]]
[[Category:Balao-class submarines]]
[[Category:Cold War submarines of the United States]]
[[Category:Korean War submarines of the United States]]
[[Category:Friendly fire incidents of World War II]]
[[Category:Maritime incidents in September 1944]]
[[Category:Maritime incidents in 1970]]
[[Category:Ships built in Kittery, Maine]]
[[Category:Ships sunk as targets]]
[[Category:World War II submarines of the United States]]

USS Segundo - Revision history

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