All of which, mind, would be readily visible to any Russian spy satellite, essentially telegraphing intent to Moscow months to years in advance. (Those are larg

All of which, mind, would be readily visible to any Russian spy satellite, essentially telegraphing intent to Moscow months to years in advance. (Those are large construction projects, of an abnormal nature, which would likely take quite a bit of industrial scale coordination to pull off). Think about it. There would be acts of Congress involved with drumming up and establishing funding and fiscal programs devoted to the task of constructing, or making available to everyone the material to construct these types of shelters. Once it was prioritized as s National Security priority posture, you can bet your sweet rear Moscow would be on the line to Washington/the State Department, and similarly mobilizing their own interests in response to what would be a transparent act of escalation in the abscence of any reasonable explanation. It would also be a clear signal to someone who actually had some intent to initiate or chance a strike that somehow, news of that had leaked to their adversaries as well, even if they vehemently denied any such intent up to zero-day. You don't just mobilize on that kind of scale, militarily, or civically without sending very clear and obvious signals to other nation states with even a modicum of interest in self-preservation in the face of external threats. Especially in today's highly interconnected world.