Hydraulics used to build pyramids....?

[Imperial Dave]

https://www.zmescience.com/science/news-science/egypt-pyramid-hydraulic-system/

Interesting

[Ian61]

Hummm! Nice diagram but not yet convinced. If it worked well they would have used it for the later pyramids and there would be more than this fragmentary, at best evidence.

[Jim Webster]

Given they have managed to find voids inside pyramids using modern scanning technology, you'd have thought they'd have found the vertical passages necessary to lift the stones using water? 

[Keraunos]

I've always thought of the Pyramid construction program as an unemployment relief activity, so labour saving devices would be beside the point