For 35 years it was the site of a vital piece of Cold War infrastructure, one intended to preserve the function of the Canadian Government in the event of a nuclear war. And so what was supposed to be Canada’s greatest Cold War secret was exposed by nothing more than some poorly-placed toilets. With the end of the Cold War, in 1994 the Diefenbunker was finally shut down and stripped of all its equipment. Today the restored bunker operates year-round as Canada’s Cold War Museum, and stands as a stark reminder of a dark and fearful period in World History. #2: The Diefenbunker incident wasn’t the only time toilets nearly gave away Cold War secrets.