It's now know the pyramids had multiple functions, it was a Industrial Facility for whatever civilization build it. It was a water pump for irrigation, a power plant and a chemical plant too.
There's some other speculative things like
>what did they did with the energy being produce?
well, if you follow the few remote viewers that try to look the construction of the great pyramids, it was actually use to power a data center for the zelites of the period and do a light show in the sky for the pleb of the period, like a spiritual thing.
For me the remote viewers have figure it out a lot of the missing pieces.
Of course, it's as speculative as those clownish vids of archekikes trying to cut stone
>never mind they took 2 years to do so
and didn't even reach the same standards as the originals, that are everywhere in egypt. Some even in the ceilings, kek.