KSS-III submarine

	KSS-III Batch-I SS-083 Dosan Ahn Changho-class submarine.
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	1
Completed	3
Active	3
General characteristics
Type	Attack submarine
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);
Length	Batch-I:-; 83.5 m (273 ft 11 in); Batch-II:-; 89.0 m (292 ft 0 in);
Beam	Batch-I:-; 9.6 m (31 ft 6 in); Batch-II:-; 9.6 m (31 ft 6 in);
Draught	Batch-I:; 7.62 m (25 ft 0 in);
Propulsion	Diesel-electric propulsion; Air-independent propulsion (AIP); 3 × MTU 16V396SE84L marine diesel engines; 4 × Bumhan Industries PH1 PEM fuel cells, each with 150 kW;
Speed	12 knots (22 km/h; 14 mph) (surfaced); 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 and ; 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 (Korean Submarine-III) or Dosan Ahn Changho-class is a series of diesel-electric attack 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 Changho, being commissioned on 13 August 2019. The second ship, ROKS Ahn Mu, was commissioned on 20 April 2023.

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