Believe it or not, no aliens were likely involved! Just some very smart humans and a massive amount of labor.
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Yeah people really forget how recent an invention good rope is, It’s not like they could just order a few hundred meters on ebay. Making all that rope would probably be more effort and expense than a lot of the stuff that people write of as too complex for them to have considered, like temporary canals or raise and drop sledding.
Rope braiding is pretty fast. Especially if you’re an ancient Egyptian woman who’s done it full time for decades. They had hemp, which is the same stuff that rigged up the giant sailing ships of later on in history.
