Anyone who denies that machining and moving of rock that we still cannot replicate happened in antiquity should read Chris Dunn’s books and watch this video featuring Russ Allen.
Russ Allen points out that many major constructions such as the Serapeum, Osireion, obelisk at Aswan, and large blocks at Baalbeck and the Yangshan Quarry in china are unfinished and that this displays the techniques being employed to create them. Whatever civilisation did this they could remove granite as though it were butter. The scoop marks under the unfinished obelisk indicate some kind of of high technology beyond our own. We are gaining hints as to how this might be possible through the work of Malcolm Bendall and Bob Greenyer – harnessing magnetic monopoles and ball lightning can disintegrate matter.
The marks left in the granite indicate the use of large, carefully controlled machines. These must have been made of metal. There is no other material that could produce the deep and long saw cuts seen on many blocks or make the core drill holes. The thousands of granite vases found have now been shown to be cut to a level of accuracy that would require a five-axis lathe. And the lathe itself would need to have been made to an even higher accuracy than the vases.
This begs the question of why there is no evidence left of them. Large amounts of iron would surely leave detectable iron oxide. Stainless steel would survive many thousands of years. The complete cessation of work on these constructions suggests a major sudden global disaster but the absence of evidence of the machines suggests organised withdrawal.
The younger dryas impact hypothesis can provide the disaster but where did the machines go?