“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.
Sound idea to undermine a structure that is estimated to weigh 5.75 million tons.
*Not given if that number is US tons or Metric tonnes.
Read “Egyptian Dawn” by Robert Temple - and you will learn that the Giza complex was built as one unit. He draws that conclusion by using the angles and dimensions of the structures which are all based on the Golden Angle - a very important reference in Ancient Egyptian buildings and statues.
BTW: did you k now that Ancient Egyptians did not use multiplication tables or division as we do today? Just addition and subtraction.