I will not go into great detail concerning the following links, I will just let the "links" and the revelations within them speak for themselves...

Ancient astronauts in California who colonized other star systems FROM EARTH...from their massive underground cavern cities beneath Death Valley's Panamint mountains:
https://www.bibliotecapleyades.net/vida_alien/alien_races03a.htm

Two men who claim to have explored the upper levels of an abandoned underground city beneath the Panamint mountains. The city was vacant, suggesting that its inhabitants migrated to even deeper cavern systems below:
ancient civilization beneath death valley (google search) / & https://www.angelfire.com/ut/branton/10466.html

Brazilian UFO "contactee" is taken to a huge underground base-network beneath Death Valley by visitors from the Vega star system:
https://www.bibliotecapleyades.net/vida_alien/warheaven03.htm

Tom Wilson, a Paiute 'Indian' talks about the discovery of an underground 'city' beneath the Panamint/Death-Valley area:
https://historydaily.org/does-death-valley-conceal-an-ancient-subterranean-city-the-legend-of-shin-au-av.

Even the convicted murderer Charles Manson claims to have heard of this underground 'world' beneath Death Valley:
http://murdersofaugust69.freeforums.net/thread/483/charles-manson-search-underground-world

More on the colonization of other worlds using the ancient technology of those ancient sea-faring surface dwellers who took refuge within the underground cities of the Panamint/Death-Valley regions:
https://www.angelfire.com/ut/branton/erthbrn1.html

Lost underground City of the Death Valley Desert Giants:
Google Search

Two weird trips to Death Valley... 1849 and 1949. Giants, aliens, underground cities of gold:
https://beta.prx.org/stories/267590

A www.google.com video search for: Death Valley - Panamint - underground city:
Google Search

A www.google.com video search for: Death Valley - underground - giants:
Google Search

A www.google.com video search for: Death Valley - underground - aliens:
Google Search

A www.google.com video search for: Death Valley - Panamint - underground base:
Google Search

A www.google.com video search for: Panamint subterranean:
Google Search

branton