Dosan Ahn Changho-class submarine

	ROKS Dosan Ahn Chang-ho
Class overview
Builders	Hanwha Ocean; HD Hyundai Heavy Industries;
Operators	Republic of Korea Navy (ROKN)
Preceded by	Son Won-il class (Type 214 submarine)
Cost	USD $900,000,000 per submarine
Built	2014–present
In service	2021–present
Planned	9
Building	3
Completed	3
Active	3
General characteristics
Type	Attack submarine with ballistic missile launching capabilities
Displacement	Batch-I:-; 3,358 t (3,305 long tons) (Surfaced); 3,750 t (3,690 long tons) (Submerged); Batch-II:-; 3,600 t (3,500 long tons) (Surfaced); 4,000 t (3,900 long tons) (Submerged);
Length	Batch-I:-; 83.5 m (273 ft 11 in); Batch-II:-; 89.3 m (293 ft 0 in);
Beam	Batch-I/II:-; 9.6 m (31 ft 6 in);
Draught	Batch-I:-; 7.62 m (25 ft 0 in);
Propulsion	Batch-I:-; Diesel-electric propulsion; 3 × MTU 16V396SE84L marine diesel engines; Air-independent propulsion (AIP); 4 × Bumhan Industries PH1 PEM fuel cells, each with 100 kW; Batch-II:-; Diesel-electric propulsion; 3 × MTU 12V 4000 U83 marine diesel engines; Air-independent propulsion; 4 × Bumhan Industries PH1 PEM fuel cells, each with 100 kW with increased hydrogen and liquid oxygen storage; Samsung SDI lithium-ion batteries;
Speed	12 knots (22 km/h; 14 mph) (surfaced); 6 knots (11 km/h; 6.9 mph) (submerged) on fuel cell operation; 20 knots (37 km/h; 23 mph) (submerged);
Range	10,000 nmi (19,000 km; 12,000 mi)
Endurance	20+ days (submerged)
Complement	50
Sensors &; processing systems	Combat suite:; Hanwha-developed "Combat Management System" (CMS); Sonar:; LIG Nex1-developed sonar suite; Thales-developed mine-avoidance sonar; Electronic warfare:; Indra-developed radar electronic support measurement (RESM); Other processing systems:; Safran-developed "Series 30" optronic surveillance mast; Babcock-developed "Weapons Handling and Launch System" (WHLS); ECA Group-developed steering consoles;
Armament	Batch-I:-; 6 × 533 mm (21 in) torpedo tubes ; LIG Nex1 K761 Tiger Shark heavyweight torpedoes; 6 × K-VLS cells ; 6 × Hyunmoo 4-4 submarine-launched ballistic missile; Batch-II:-; 10 × K-VLS cells ; 10 × Hyunmoo 4-4 submarine-launched ballistic missile; Chonryong land attack cruise missile;
Notes	First-ever AIP-equipped submarine capable of launching submarine-launched ballistic missiles (SLBM).

The KSS-III Batch-I (Korean Submarine-III Batch-I; Korean: 한국형 잠수함-III 배치-I; Hanja: 韓國型潛水艦-III 배치-I), officially called Dosan Ahn Changho class (Korean: 도산안창호급 잠수함; Hanja: 島山安昌浩級潛水艦; RR: Dosan-anchangho-geup Jamsuham) is a series of diesel-electric attack and ballistic missile submarines currently being built for the Republic of Korea Navy (ROKN), jointly by Hanwha Ocean and HD Hyundai Heavy Industries (HHI). The KSS-III is the final phase of the Korean Attack Submarine program, a three-phased program to build 27 attack submarines for the ROKN, between 1994–2029.

The KSS-III initiative consists of the development of nine diesel-electric attack submarines, capable of firing submarine-launched ballistic missiles (SLBM), to be built in three batches, between 2014–2029.

A total of three submarines of the first batch of the series have been launched, with the first submarine, ROKS Dosan Ahn Chang-ho, being commissioned on 13 August 2019. The second ship, ROKS Ahn Mu, was commissioned on 20 April 2023.