There is evidence that the Giza plateau had a 4th pyramid, that was made of a darker material. Documented in 1674 by Cornelis De Bruijn (1652-1727) Illustrator; then, by Frederic Ludvig Norden (1708-1742) cartographer. Both were tasked at drawing what they saw.
There is discussion about this elsewhere, but it may be connected to the so-called "dark pyramid" in Alaska; that there may have existed a network of these, in the configuration that was likely intended to provide energy.
We know for a fact that the Egyptian gov't has nixed efforts to excavate. There is a labyrinth near the great pyramid but they prevented that from being uncovered, and so on. They are obsessed with a specific narrative, but I suspect there are other motives to keep things hidden.
This is all likely connected to a much older civilization that existed on earth, well before the "great flood".
Farsight might expand on their prior publication that had a specific focus. There's a lot of information to be discovered.