I talked to one not long ago. We discussed the 3-5 minute pace,..he said,"that's insane"(his words not mine). Then he said,"maybe they had a laser". Tell you what,..give them a laser and they still can't do it. But, give them a bunch of lasers, and then maybe,..just maybe.
Also, the origin and history of the Archimedes Screw is disputed. If they had it, maybe it reminded them of a geyser(that one's just for you cladking,..God help us all) or the bucket elevator, then that would be a game changer,...enter the Funicular.