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Gotland-class submarine


Gotland-class submarine

HSwMS Gotland
Class overview
Builders: Kockums
Operators:  Swedish Navy
Preceded by: Västergötland
Succeeded by: A26
Planned: 3
Completed: 3
  • HSwMS Gotland
  • HSwMS Uppland
  • HSwMS Halland
General characteristics
Type: Submarine
  • Surfaced: 1,494 tonnes (1,470 long tons)
  • Submerged: 1,599 tonnes (1,574 long tons)
Length: 60.4 m (198 ft 2 in)
Beam: 6.2 m (20 ft 4 in)
Draft: 5.6 m (18 ft 4 in)
  • 2 × Diesel-electric MTU engines
  • 2 × Kockums v4-275R Stirling AIP units
  • Surfaced: 11 knots (20 km/h)
  • Submerged: 20 knots (37 km/h) on batteries; 5 knots (9.3 km/h) on AIP
  • 18-22 Officers
  • 6-10 Seamen
Sensors and
processing systems:
CSU 90-2 Integrated sonar sensor suite
  • 4 × 533 mm (21.0 in) Torpedo tubes
  • 2 × 400 mm (15.7 in) Torpedo tubes
  • 48 × Externally Mounted Naval Mines [1]

The Gotland-class submarines of the Swedish Navy are modern diesel-electric submarines, which were designed and built by the Kockums shipyard in Sweden. They are the first submarines in the world to feature a Stirling engine air-independent propulsion (AIP) system, which extends their underwater endurance from a few days to weeks.[2] This capability had previously only been available with nuclear-powered submarines.


  • Features 1
  • Units 2
  • Deployments 3
    • Secondment to United States Navy 3.1
  • Overhaul 4
    • Initial Discussions 4.1
    • Mid-life Upgrade Contract 4.2
  • See also 5
  • References 6
  • External links 7


As of 2008, the Gotland-class attack submarine is one of the most modern submarines of the Swedish Navy in service, mainly designed for submarine missions such as antiship/antisubmarine warfare, collecting of intelligence (communications intelligence (COMINT), electronic signals intelligence (ELINT)), forward surveillance, special operations, and mine-laying tasks.[2]

On the water surface, the submarine is powered by two sets of MTU engines. While submerged, the Kockums-built Stirling engine AIP system is used to drive a 75-kilowatt (101 shp) generator for either propulsion or charging the batteries. A Stirling engine is particularly well suited for a submarine because the engine is near silent and can use the surrounding sea water as a heat sink to increase efficiency. Submerged endurance is dependent on the amount of liquid oxygen stored on-board and is described as "weeks". The class is characterized by its low acoustic signatures, extreme shock resistance, and a competent combat system.[2]

Kockums touts extreme maneuverability for this class due to the hull design and a well-placed X rudder. The X rudder provides four control surfaces, along with two mounted on the sail, which enables sharp turns and the ability to operate very close to the seabed. Ship automation and computerized steering allow a single operator to steer the submarine in depth and course, which also results in a smaller crew complement, leading to good accommodation standards and low operating costs.[3]

The class has many features that enhance stealth, helping it to remain undetected. All shipboard machinery is isolated and mounted on rubber dampeners to reduce vibrations and noises; a hydrodynamic hull design reduces noise, infrared signature, and active sonar response, counteracting its magnetic signature with 27 independent electromagnets, and short circuiting extremely low frequency (ELF) electrical fields; various hull coatings reduce active sonar response, and coating the mast with radar-absorbent material. Combined with the near-silent operation of the Stirling generator and slow-turning propeller to prevent cavitation, the boats are very difficult to detect under water, especially in their normal area of operations, the Baltic Sea.[3]

Drawing of the ships in the class


Ship name Laid down Launched Commissioned Service Status Coat of arms
HSwMS Gotland 10 October 1992 2 February 1995 1996 1st Submarine Flotilla Active
HSwMS Uppland 14 January 1994 8 February 1995 1996 1st Submarine Flotilla Active
HSwMS Halland 21 October 1994 27 September 1996 1996 1st Submarine Flotilla Active


After being refit and upgraded to sustain the higher temperatures of tropical water,[4] HSwMS Halland took part in a multi-national exercise in the Mediterranean from September 16, 2000. Allegedly, there she remained undetected while still recording many of her friendly adversaries, attracting interest from the participating countries. In early November the same year, she participated in a NATO "blue-water" exercise in the Atlantic. There, she reportedly won a victory in a mock "duel" with Spanish naval units, and then the same in similar duel against a French SSN, a nuclear-powered attack submarine. She also "defeated" an American SSN, the USS Houston.[4]

Secondment to United States Navy

HMS Gotland onboard M/V Eide Transporter in San Diego
HMS Gotland transits through San Diego Harbor with the Nimitz-class aircraft carrier USS Ronald Reagan (CVN 76) following close behind during the “Sea and Air Parade” held as part of Fleet Week San Diego 2005.

In 2004, the Swedish government received a request from the United States of America to lease HSwMS Gotland – Swedish-flagged, commanded and manned, for a duration of one year for use in antisubmarine warfare exercises. The Swedish government granted this request in October 2004, with both navies signing a memorandum of understanding on March 21, 2005.[5][6] The lease was extended for another 12 months in 2006.[7][8][9] In July 2007, HSwMS Gotland departed San Diego for Sweden.[10]

HSwMS Gotland managed to snap several pictures of the USS Ronald Reagan during a wargaming exercise in the Pacific Ocean, effectively "sinking" the aircraft carrier.[11] The exercise was conducted to evaluate the effectiveness of the US fleet against diesel-electric submarines, which some have noted as severely lacking.[12][13]


Initial Discussions

In March 2013, Kockums received an initial order for an overhaul for two of the Gotland-class submarines. The overhaul was expected to be completed by 2017. With these upgrades, the submarines would be able to remain in active duty until after 2025.[14] On 2 April 2014, the Swedish defence minister, insisting on the importance of submarines to the security of Sweden, announced the Government's intent to upgrade two of the Gotland-class vessels, as well as purchase two new "stealth" submarines of another type.[15]

Mid-life Upgrade Contract

Negotiations concluded on 30 June 2015 with the signature of a contract between Sweden's Defense Material Administration (FMV) and Saab Kockums. In addition to the construction of two new Type 26 A SSKs, the contract provides for a mid-life upgrade of HSwMS Gotland and her sister ship HSwMS Halland, for SEK 2.1 million. The Gotland is expected to return to the FMV in late 2018 and the Halland in late 2019, following a series of platform and combat systems upgrades. The FMV has also asked for option prices for upgrades to HSwMS Uppland, the third vessel of the class.[16]

See also


  1. ^
  2. ^ a b c
  3. ^ a b
  4. ^ a b News 2000
  5. ^
  6. ^
  7. ^
  8. ^
  9. ^
  10. ^
  11. ^
  12. ^
  13. ^
  14. ^
  15. ^
  16. ^

External links

  • class submarinesGotlandOfficial Kockums website on
  • Kockum's AIP Sterling system
Video links
  • NBC news report on the Gotland class on YouTube
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