High Quality Content by WIKIPEDIA articles! The Archer class submarines are the newest class of diesel-electric submarines in active service with the Republic of Singapore Navy. Originally launched as the Swedish Navy Vastergotland class submarines HMS Halsingland and HMS Vastergotland in 1986 and 1987, the two submarines were sold to Singapore in November 2005 and relaunched in June 2009 after extensive modernisation by Kockums, which included a refit to Sodermanland class standards, the insertion of a new hull section with an air independent propulsion system, and additional climatisation for use in tropical waters. Singapore's Ministry of Defence signed an agreement with Kockums for the supply of two Archer class submarines to the RSN on 4 November 2005. More than 20 years old and previously in reserve with the Swedish Navy, the submarines will be transferred to the RSN on completion of the modernisation and conversion for operation in tropical waters. RSS Archer was launched on 16 June 2009. RSS Archer will be undergoing sea trials following its launch and is expected to return to Singapore in 2010.

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