I just watched the documentary Trinity and Beyond where it showed footages of nuclear detonations. There were over 300 such tests between 1945 and 1970. Why didn't any accidental nuclear detonations occur in those tests. What kind of triggering device did they use to make the nukes explode? I don't think it is simply touching two wires together. But in those times.. there were no computer codes either. So how did the triggering button or signal work?