During the Second World War, Swansea's Queen's Dock was one end of the world's first test of a full-scale submarine oil pipeline, in Operation Pluto. Swansea was a target for Nazi German bombing raids due to its industries, the port, and railways. By the end of the so-called Three Nights' Blitz, three consecutive nights of particularly intensive bombing in February 1941, the town centre was flattened, along with many residential streets. Rebuilding post-war was in typical British nineteen-fifties style and much of the result is regarded with high favour by neither residents nor visitors. One consequence of the bombing and rebuilding is the movement of the town centre by about half a mile. Pre-war, the town centre was on an axis around High Street and Wind Street. Post-war, Oxford Street and the new road the Kingsway took more prominence.