I have been skeptical of DUMBS for a long time- but the more I learn about ( and watch Lost Battlefields on Youtube) the more the enormous scale of WW2 German DUMBS sinks in-literally hundreds of Kilometers of tunnels. We brought the folks behind these to the US after the war (Op. Paperclip) so I am sure that we have at least what the Germans did, and likely orders of magnitude more.
I have been skeptical of DUMBS for a long time- but the more I learn about ( and watch Lost Battlefields on Youtube) the more the enormous scale of WW2 German DUMBS sinks in-literally hundreds of Kilometers of tunnels. We brought the folks behind these to the US after the war (Op. Paperclip) so I am sure that we have at least what the Germans did, and likely orders of magnitude more.