RDV 01 Crystal
RDV 01 "Crystal" was a research vessel of the Royal Navy. An unpowered floating platform, it was designed to be used during sonar research and development projects at the Admiralty Underwater Weapons Establishment (AUWE) at Portland Harbour, Dorset. It was not fitted with any propulsion or steering gear. Ordered from the builders HM Dockyard, Devonport, in December 1969, it was launched in March 1971. It was sold on 18 September 1992 to a Dutch concern.