Walking around on the planet Arrakis, also known as Dune, is a dicey proposition. Gargantuan sandworms are attracted by the rhythmic tremors caused by footsteps and quickly arrive to gulp down whoever is stomping around on the sandy dunes.
That's where the sandwalk comes in, a method of dune traveling practiced by Arrakis natives known as Fremen. In his novel Dune, Frank Herbert describes the sand walk as making your footsteps "sound like the natural shifting of sand" to avoid alerting the sandworms. "Step… drag… drag… step… step… wait… drag… step…"
