America built a secret network of remote underground bunkers during “The Cold War” in case of nuclear strike by the Russia. But they were not made to protect civilians – the hideouts is just for Top Government Officials.
Related: Raven Rock: The Story of the U.S. Government’s Secret Plan to Save Itself – While the Rest of Us Die
Also: List of DUMBs by State – Complete List of Military Underground Bases in USA
In America alone there are over 188 Deep Underground Military Bases situated under most major cities, US AFBs, US Navy Bases and US Army Bases, as well as underneath FEMA Military Training Camps and DHS control centers. There are also many Deep Underground Military Bases under Canada.