Quote:
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"One of the prequels mentioned that it had once had a normal-ish ecosystem with liquid water on the surface, and suggests that the sandtrout were actively keeping it dry by locking down any moisture they could find. After all, the monocology had been broken in God-Emperor of Dune before getting mostly restored thousands of years later."
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Exactly!! it was suggested on the Sequels/prequels that The worms/sandtrout were not originally native to Dune but indeed were transplanted there by some long forgotten ancient race.
It Dune Chapter house it was proven that any planet that can successfully host sand trout will eventually be come a desiccated desert world inhabited by Worms
(Adult sandtrout)
I dont see how Herbert not exploring this
In detail was a literary shortcoming.
as his focus was
Characters and the Societal /political structure
not secret archeological origins.