Another role, during World War II, was the building of some sections for the two Mulberry harbours, the floating ports on which the Allies depended after D-Day. Troops were based locally, in military camps. At the end of the World War II, the Atlantic U-boat fleet surrendered in Loch Ryan and was anchored in the port before being towed to the North Channel and scuttled, this activity was codenamed 'Operation Deadlight'.
