Industrial may be correct according to one engineer - strange as it seems, everything points to some sort of power generator - one which suffered a catastrophic failure. Chris Dunn’s book (Giza Power Plant - even if you disagree) has some very interesting observations about the interior structure and crystalline natures of the stones used, and how those properties could have been used to generate some sort of power - the exact nature and use of which seems elusive.
The stone box in the Great Pyarmid was manufactured to very close tolerances. Things you could not achieve with a copper tool. That’s what I was thinking its an industrial place.
https://www.youtube.com/watch?v=BS8fPje0mwU
Chris Dunn has a video out about the Giza power plant that you told me about the book .
Arounf 1 hour 36 minutes he mentions the box.