UPHOLDER CLASS TYPE 2400 PATROL SUBMARINES - 1986 ONWARDS
The Type 2400 conventional diesel/electric ocean-going patrol submarines were conceived as the successors to the Oberon Class Patrol submarines and initial estimates were drawn up for 10 replacement boats which would remain in service with the Royal Navy well into the 21st century
The Type 2400 was an all-new design revealed in 1979 that benefitted considerably from the research and development programme carried out for the Royal Navy's nuclear-powered fleet submarines. The hull form in particular incorporated many