MULBERRY B Survey – the UK Hydrographic Office has teamed up with commercial survey firm Netsurvey to conduct the first detailed survey of Mulberry B - also known as Port Winston - for the first time in nearly twenty years and to produce 3D images of the underwater remains, lying at a depth of about five metres.    The Mulberry B was built off Arromanches (France), as one of two temporary harbours built to support the Normandy landings in June 1944.