The map below indicates an underground tunnel system throughout the United States. The tunnel system is shown extending into Canada and Mexico, as early as 1978. The map has been attributed to TAL LeVesque, but is not verified.
Because of the connection to Mexico, it’s possible that some of the main tunnel sites are guarded by drug cartels.
The term “inner-Earth” should be taken to mean, ‘underground’ or ‘subterranean’, and not that of Jules Vern’s ‘center of the Earth’ theory.