During our first visit, in 1970, we entered the cathedral through massive west doors, and in the north aisle saw a large dome-shaped bunker made of stone blocks. An English-speaking priest told us that guns and ammunition were stored there during the war. He said that as a warning, a bomb was dropped near the base of the north tower, resulting in minor damage.
Other tourists, including our daughter, said they had been told that same tale, and that same anecdote was re-told during our second visit, a few years later.
In 1991 Jim went to the cathedral office and repeated the fantasy we had been told twenty-one years earlier. The Cathedral architect was shocked to hear that yarn and showed us a book that detailed how stained-glass windows and other art would be stored for protection from possible damage. He couldn't imagine that story, but admitted that was the fable tourists might expect to hear.