RC Hoagland sure likes to explore the possibility of ancient high tech civilizations.
https://www.coasttocoastam.com/article/richard-c-hoagland-links-images-121923
https://www.coasttocoastam.com/show/2023-12-19-show
https://www.coasttocoastam.com/article/anomaly-hunter-spots-alien-village-on-mars If there was an ancient cataclisim on Mars and some beings were forced to live in primative conditions on the surface, who on Earth would ever know? Some might have set up underground cities, while others just evacuated the planet.
