The shipment, I’m afraid, is mostly lost. I barely made it out myself. Bandits gave chase, so we took the convey on a more direct route to Arrakis. In our flight, we drove over a patch of drum sand. It is a curious phenomenon, created by just the right confluence of factors (sand grain uniformity, compactness, etc.)
The effect is otherworldly. The strangest music. A single footfall can produce repeating drumming of a primordial cadence. Our convey created a cacophony that vibrated our innards. The worms soon came.
I and a few others made it to a set of rocks. The rest, goods and bandits a alike, were taken by the worms.