Challenger-class submarines, formerly the Royal Swedish Navy’s Sjoormen-class, joined the RSN in the 1990s. The then-deputy prime minister and minister for defence Dr Tony Tan Keng Yam ...

Between 1995 and 1997, the RSN bought four Sjoormen-class submarines from the Swedes, refurbished them and renamed them the Challenger class. These 51m-long subs were built for the Royal Swedish ...

The history of Singapore’s submarine program dates back to the mid-1990s, when the RSN bought four Sjoormen-class submarines from Sweden, which it refurbished and renamed the Challenger class.

RSN begins submarine development by acquiring a refurbished Sjoormen-class submarine built in the 1960s from the Swedish Navy. It acquires another three in 1997. The boats are relaunched as the ...

[[nid:702715]] Previously Royal Swedish Navy Sjoormen-class submarines, the Challenger-class submarines entered service with the Singapore Navy in the 1990s. RSS Conqueror and RSS Chieftain were ...