I'm trying to figure out what are those recently discovered, spiral structures beneath the Great Pyramids supposed to be. I don't think they are cities. They might be drills or pumps of some kind, but for what?

Over the years, people have made connections with the Great Pyramids and the Tesla Coil. The Tesla Coil was supposed to wirelessly broadcast electricity and it's been speculated over the years that the Pyramids were for something similar. Maybe they harvested some underground energy, maybe geothermal or something else and broadcasted it.

Or it could be the inverse. They tapped into free energy from the ionosphere or the electric current between celestial bodies (if the Electric Universe theory turns out to be correct) and transmitted the power through the ground, maybe across the entire planet.