Re: Keep an eye on the front gardens
As far as I know there are also fun caches of explosives in entertaining places in Switzerland, that's why some tunnel fires are approached with extreme caution by their fire brigades.
Not that they're easily accessible, of course, that would make it too easy to sabotage, but it strikes me as a good defence against invasion.
Thanks for the tip, I'll have a look for it, possibly even as early as next week.