JS Sōgei

Launching of Sōgei, 14 October 2025
History
Japan
NameSōgei
OrderedFiscal year 2022
BuilderKawasaki Heavy Industries Kobe Shipyard
CostApproximately 73.6 billion yen
Laid down28 March 2023
Launched14 October 2025
CommissionedMarch 2027 (scheduled)
IdentificationPennant number: SS-518
StatusTo be commissioned
General characteristics
Class & typeTaigei-class submarine
Displacement3,000 t (3,000 long tons) (standard)
Length84 m (275 ft 7 in)
Beam9.1 m (29 ft 10 in)
Depth10.4 m (34 ft 1 in)
Installed power6,000 PS (4,400 kW; 5,900 hp) (shaft output)
Propulsion
SpeedApproximately 20 kn (37 km/h; 23 mph)
Crew70
Sensors &
processing systems
  • OYX-1 Information processing subsystem
  • ZQX-12
  • 1x ZPS-6H surface search radar
  • ZQQ-8 Integrated Sonar
Armament

JS Sōgei (Japanese: そうげい; Pennant number: SS-518) is a diesel-electric submarine of the Japan Maritime Self-Defense Force, and the sixth boat of the Taigei-class. Her name, written in kanji as "蒼鯨", translates to "blue whale".[1] She is the first Japanese naval vessel to bore that name, as the Imperial Japanese Navy had not used the name.[2][3]

Construction and career

Sōgei was ordered in the fiscal year 2022 as part of JMSDF's Mid-Term Defense Program. She was laid down on 28 March 2023 at Kawasaki Heavy Industries' Kobe Shipyard, and launched on 14 October 2025.[1][4] The vessel would then undergo a fitting out process and a period of sea trials, being scheduled to be commissioned in March 2027.[2][3]

References

Footnotes

  1. ^ a b 防衛省 海上自衛隊 [@JMSDF_PAO] (2025-10-14). "潜水艦「そうげい」命名式・進水式" (Tweet). Retrieved 2024-10-14 – via X (formerly Twitter).[better source needed]
  2. ^ a b "海自期待の最新潜水艦「そうげい」誕生！ 仏原子力潜水艦よりデカいぞ 就役はいつ？". 乗りものニュース (in Japanese). 2025-10-14. Retrieved 2025-10-14.
  3. ^ a b Takahashi, Kosuke (2025-10-14). "海自の最新潜水艦たいげい型6番艦「そうげい」が命名・進水 漢字では「蒼鯨」 旧海軍での命名実績なし". Yahoo!ニュース (in Japanese). Retrieved 2025-10-14.
  4. ^ "海自向け新型潜水艦「そうげい」進水 戦後32隻目 川崎重工が建造". 毎日新聞 (in Japanese). 毎日新聞社. 2025-10-14. Retrieved 2025-10-15.
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