During a recent interview with Vulture (via SFFGazette.com), Dune Sound Designers Theo Green and Mark Mangini revealed that the movie originally included Sandworm larvae. Known as "Sandtrout," they were featured prominently in Frank Herbert's novel and Paul's Spice dreams in the movie were originally going to depict the Sandworms' life cycle while revealing more about how they exist on Arrakis.
"It was something that was only ever in the storyboard phase and not developed further, but we did create a few sounds for it," Green confirmed, describing this scrapped part of the movie as a "psychedelic" experience for viewers. "We had Paul seeing the sandtrout and came up with a very strange sound, like a heartbeat, like a watery heartbeat. That could be tapped into for Part Two."
"In the end, we don’t really hear them in this part, but I think we will be digging into those pieces of research when we come to part two," Mangini added. "We were giving hints in the early parts of this film that it will become something bigger in the next one."
Production Designer Patrice Vermette, meanwhile, revealed in a separate interview with the site that the story didn't always end with Paul and his mother Jessica walking with the Fremen through the desert after Paul kills Jamis. "We were initially going to go further into the story. Throughout preproduction, the script moves, it finds its place. It’s never definite until a certain time."
"So during the soft prep, there were areas of the screenplay that we did not end up covering when we locked the script and decided to shoot," he added, confirming that "there are elements already designed that will be in Part Two." This is likely a reference to Paul's arrival at the Fremen Sietch, the tribe's hidden communities where the legend of Muad'Dib is born and the story picks up the pace.
Dune: Part Two is expected to be released on October 20, 2023.