The UK Hydrographic Office (UKHO) has released stunning images from a survey of the underwater remains of an artificial harbor used in World War II that was used to facilitate rapid offloading of cargo onto the beaches during the Allied landings in Normandy. The images of Mulberry B, which was one of these portable temporary harbors developed and built in total secrecy by the British in World War II, have been created from a detailed 3D map that will allow archaeologists to assess the rate of deterioration of the remains.