Back in the 80s it wasent a secret. Popular mechanics, I think or one of them,wrote articles about it .back when we thought the russians were gonna nuke us we built tunnels for military response since the road and rail network would have been toast.pretty sure when people are talking about wierd ringing and tiny quakes they are just finishing these,by now it's just a job for life cash grab.i suspect barry never got told
Back in the 80s it wasent a secret. Popular mechanics, I think or one of them,wrote articles about it .back when we thought the russians were gonna nuke us we built tunnels for military response since the road and rail network would have been toast.pretty sure when people are talking about wierd ringing and tiny quakes they are just finishing these,by now it's just a job for life cash grab.i suspect barry never got told