That use to be true, but isn't anymore. I'm pretty sure that most of them have been removed by now and new bridges and tunnels are no longer built with explosi

That use to be true, but isn't anymore. I'm pretty sure that most of them have been removed by now and new bridges and tunnels are no longer built with explosives. Wouldn't it be just as easy these days to just fire a few missiles at the bridges and tunnels if another country is invading? Yes, and it's much safer and much cheaper to maintain. I remember reading about a tunnel fire that could have set them off and would have been disasterous. http://www.swissinfo.ch/eng/archive/Lucerne_yields_up_explosive_secrets.html?cid=3456984 http://www.swissinfo.ch/eng/archive/Lucerne_yields_up_explos... http://www.oltnertagblatt.ch/panorama/vermischtes/armee-holt-sprengstoff-aus-der-bruecke-3347862 http://www.oltnertagblatt.ch/panorama/vermischtes/armee-holt... https://en.wikipedia.org/wiki/National_Redoubt_(Switzerland) https://en.wikipedia.org/wiki/National_Redoubt_(Switzerland)