I have heard about these tunnels a while ago, but I haven’t read in depth articles about them. Interesting reading if you are curious about ancient Egypt. I have been aware of the Atlantean involvement in ancient Egypt and their advanced technology and knowledge. So this doesn’t surprise me. We know much more about ancient Egypt now than we did 20 years ago and have new technologies to assist us in archaeology.
I wonder if they use drones with good lighting attached, to fly into areas where it may be risky for humans to go. A small drone could provide some clarity and video footage of what is in the area being searched.