system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune] How do those huge 500 meter long sandworms travel through the deep sand? And how can they detect footsteps if they themselves are thrashing about?

You cant really detect motion vibrations if you yourself are creating a massive amount of tremors and vibrations at your own location.  

and how the hell would huge worms travel through sand?
gpt
When they want to listen, they lie still.

When they want to move... basically the entire outside *and* inside of the worm is designed for locomotion. They take a large amount of the sand blocking their way, ingest it, filter out the micro-organisms they live on like a baleen whale, and poop out the sand. Their outside has ring segments that expand and contract like an earthworm, forcing them into the hole they made.