When I worked for Citicorp in the late 80s we switched over much of our backbone to private fiber. At the time I was shown detailed fiber routes for Sprint's network and after the meeting discussed how easy it would be for a disgruntled former employee to dig up multiple locations along their the often rural and remote routes and sabotage the entire network. The scenario that particularly concerned me was trenching and installing electromechanical guillotines triggered by receive-only terrestrial pagers since a multitude of locations could be severed in any order and at will. Although it might be possible to radio locate these it could be a grueling job. Meanwhile the saboteur could extort at will and even plant new ones after areas had been declared clean. Steve