Via: http://bldgblog.blogspot.com/2012/06/va ... guise.html

To make a long story short, McPhee describes two things: how Switzerland requires military service from every able-bodied male Swiss citizen—a model later emulated and expanded by Israel—and how the Swiss military has, in effect, wired the entire country to blow in the event of foreign invasion. To keep enemy armies out, bridges will be dynamited and, whenever possible, deliberately collapsed onto other roads and bridges below; hills have been weaponized to be activated as valley-sweeping artificial landslides; mountain tunnels will be sealed from within to act as nuclear-proof air raid shelters; and much more.
First, a quick look at the system of self-demolition that is literally built into the Swiss national infrastructure:
To interrupt the utility of bridges, tunnels, highways, railroads, Switzerland has established three thousand points of demolition. That is the number officially printed. It has been suggested to me that to approximate a true figure a reader ought to multiply by two. Where a highway bridge crosses a railroad, a segment of the bridge is programmed to drop on the railroad. Primacord fuses are built into the bridge. Hidden artillery is in place on either side, set to prevent the enemy from clearing or repairing the damage.
Further:
Near the German border of Switzerland, every railroad and highway tunnel has been prepared to pinch shut explosively. Nearby mountains have been made so porous that whole divisions can fit inside them. There are weapons and soldiers under barns. There are cannons inside pretty houses. Where Swiss highways happen to run on narrow ground between the edges of lakes and to the bottoms of cliffs, man-made rockslides are ready to slide.
The impending self-demolition of the country is "routinely practiced," McPhee writes. "Often, in such assignments, the civilian engineer who created the bridge will, in his capacity as a military officer, be given the task of planning its destruction."
Read it. Those contractors exist. NATO, etc, nuff said, moving on.