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.
Almost all of these bases are over 2 miles underneath the ground and have diameters ranging from 10 miles up to 30 miles across. They have been building these bases day and night unceasingly since the 1940s. These bases are basically large cities underground connected by high speed magneto levity trains that have speeds up to 1500 mph.