Secret Underground U.S. Facilities - What lies beneath.

I thought this was interesting so I am passing it along. I see a lot of truth and some bullshit (as usual) so use your discernment as there is a lot of government propaganda. They use the words maybe, some day, could be etc. and that means they are already doing it as usual.

Americans may be aware of what's above ground, but do they know what's concealed beneath? And could subterranean facilities on U.S. soil house secrets so dangerous, our government would stop at nothing to keep them hidden? We examine the tunnels, cities, and fortresses covertly constructed beneath the feet of the American public.

Source: The UnXplained Zone on YouTube