Apprehend Christopher Dunn's book, The Giza Powerplant. I have been inside each of them a few times. I believe they were agricultural power plants (they literally propelled farms to grow food faster).
Here is a decent video to show the "port cullis" area which is a "choke" to allow them to control the frequency they were harvesting from the Grand Gallery:
Apprehend Christopher Dunn's book, The Giza Powerplant. I have been inside each of them a few times. I believe they were agricultural power plants (they literally propelled farms to grow food faster).
Here is a decent video to show the "port cullis" area which is a "choke" to allow them to control the frequency they were harvesting from the Grand Gallery:
https://www.youtube.com/watch?v=SL_kX0FJ1cw&t=16s