I can't help but think that the bomb maker was inspired by the movie Juggernaut[1], which came out just a few years before this event. In that movie, the bomb

I can't help but think that the bomb maker was inspired by the movie Juggernaut[1], which came out just a few years before this event. In that movie, the bomb maker designed and built-in several layers of booby-traps, including vibration switches, layers of detonation circuits, etc. as was used here. Not a bad movie, FWIW. [1] http://www.imdb.com/title/tt0071706/ http://www.imdb.com/title/tt0071706/