The Archer-class submarines (ex-Royal Swedish Navy’s Vaastergotland-class submarines) were designed and built by the Swedish company, Kockums AB, as single-hull, double compartment submarines optimised to reduce noise and magnetic signature. The two pressure-tight compartments also enhance safety and survivability of the crew.

The submarines were designed to operate in the shallow waters of the Baltic Sea and are therefore also optimised for operation in Singapore waters, which have similar depth profiles. Working closely with the Defence Science & Technology Agency (DSTA), the RSN adapted the Archer-class submarines to suit local operating conditions and also upgraded them to include advanced combat and sensor systems.

The Archer-class submarines are equipped with an Air Independent Propulsion (AIP) system, which enables the submarines to have longer submerged endurance and lower noise signature. This enhances the submarines’ stealth capability. The advanced sonar system allows the submarines to detect contacts at a further distance, while the torpedo system has a better target acquisition capability, which allows the submarines to engage contacts at a further range.

The crew of the Archer-class submarines has undergone two key phases of training with the RSwN. The first is the Key Personnel Training Phase, where they mastered individual vocational skills. This was followed by the Team Training Phase, where they operated as a composite crew (comprising RSwN submariners) to do mission-oriented training. To further hone their skills, submarine rescue exercises, comprising both sea training and simulator sessions, were also conducted for the crew.

RSS Archer will be undergoing sea trials following its launch and is expected to return to Singapore in 2010.

RSN's Archer-Class Submarines Specification

Length60.5 metres
Beam6.1 metres
Height11.8 metres
Draught5.6 metres
Displacement1,400 tonnes (surfaced); 1,500 tonnes (submerged)
Speed8 knots (surfaced); >15 knots (submerged)
Armament9 Torpedo Tubes
SystemsActive and Passive Sonars
Command and Weapon Control System
Radar and Electronic Warfare Surveillance Measures
Integrated Navigation System
Air Independent Propulsion System
Complement28 Crew
The Archer class diesel-electric submarines are the latest underwater platforms of the Republic of Singapore Navy (RSN). The two submarines were originally launched as the Swedish Navy Vastergotland class submarines HMS Halsingland and HMS Vastergotland respectively in 1986 and 1987.

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