Taigei-class submarine

	Taigei-class profile
	JS Taigei
Class overview
Name	Taigei class
Builders	Mitsubishi Heavy Industries; Kawasaki Heavy Industries;
Operators	Japan Maritime Self-Defense Force
Preceded by	Sōryū class
Cost	¥69.7 billion (Approx. US$ 635 million)
Built	2018-present
In commission	2022-present
Planned	10
Building	3
Active	5
General characteristics
Type	Attack submarine
Displacement	3000 tonnes (surfaced)
Length	84.0 m (91.9 yd)
Beam	9.1 m (29 ft 10 in)
Draught	10.4 m (34 ft 1 in)
Propulsion	Diesel-electric:; 2 first ships: 2 × Kawasaki 25/25SB; Following ships: 2 × Kawasaki 12V 25/31; Batteries: lithium-ion; Propulsion:: ; 1 × electric motor; 1 × shaft; 1 × propeller;
Speed	20.0 kn (37.0 km/h)
Complement	70
Sensors &; processing systems	Systems:; OYX-1 processing system; ZQX-12 tactical display system; Sonar suite Oki ZQQ-8 (Mitsubishi Electric) that includes:; Bow-mounted sonar; Flank-array sonar; Fibre-optic towed-array sonar: ; Periscopes:; Non-penetrating optical periscope (Mitsubishi Electric); ESM: NZLR-2; Surface radar ZPS-6H;
Armament	Torpedoes:; 6 × HU-606 533 mm (21.0 in) torpedo tubes with: ; Type 89 heavyweight torpedo; Type 18 heavyweight torpedo ; Missiles:; UGM-84L Harpoon Block II; Future weapon:; Type 12 anti-ship missiles; Potential weapon:; HGVP;

The Taigei-class submarines (29SS; (Japanese: たいげい; "Big Whale") is a new class of attack submarines after 2022, developed for the Japan Maritime Self-Defense Force. It is the successor to the Sōryū class.

The Taigei class is equipped with a large amount of lithium-ion batteries, as is the case with the eleventh and twelfth submarines of the Sōryū class (Ōryū and Tōryū), making it possible for the submarine to travel longer and at higher speeds under water than conventional diesel-electric submarines.