Underground structures built, but to what end?
We’re they mining precious metals? I don’t think they would go through all that labor just to bury some Pharaoh in his coffin.
“Underground structures built, but to what end?”
That question can be posed for the great pyramid as well. I’ve always discounted Christopher Dunn’s theory of the Giza Power Plant but having just read his book on that subject, and despite problems with his theory, it’s more plausible than anything else I’ve read. He’s probably closer to the mark than anyone thus far.