Södermanland-class submarine

	HSwMS Södermanland at sea
Class overview
Name	Södermanland class
Builders	Kockums
Operators	Swedish Navy
Preceded by	Näcken class
Succeeded by	Gotland class
In commission	1989–present
Planned	4
Completed	2
Cancelled	2
Active	1
Retired	1
General characteristics
Displacement	Submerged: 1,500 t (1,500 long tons; 1,700 short tons)
Length	60.5 m (198 ft 6 in)
Beam	6.1 m (20 ft 0 in)
Draft	5.6 m (18 ft 4 in)
Propulsion	2 × Hedemora Diesel-electric engines; 2 × Kockums v4-275R Stirling AIP units;
Speed	Submerged: 20 kn (37 km/h; 23 mph)
Complement	24
Sensors and ; processing systems	FAS
Armament	6 × 533 mm (21.0 in) torpedo tubes; 3 × 400 mm (15.7 in) torpedo tubes; Mines;

The

cryogenic

tanks. The AIP system can provide electric energy to extend the submarine's submerged time from days to weeks.

As of 2023^[update], Södermanland is planned to remain in service until at least 2024-25 when it was to be replaced by the future Blekinge-class submarines.^[1]^[2] However, the Östergötland was decommissioned in 2021, and is in material reserve.^[3]

Two submarines of similar design, known as the Archer class are in service with the Republic of Singapore Navy.

Units

Ship name	Laid down	Launched	Commissioned	Service	Status
Södermanland		12 April 1988	21 April 1989	1st Submarine Flotilla	Refitted 2003, Active^{[citation needed]}
Östergötland		9 December 1988	1989	1st Submarine Flotilla	Refitted 2004, Decommissioned 2021