Sandworms are large, fictional creatures found in the science fiction universe of Dune, created by author Frank Herbert. They inhabit the desert planet of Arrakis and can grow to be hundreds of meters long. Sandworms are essential to the ecosystem of Arrakis, as they produce the valuable substance known as spice, which is crucial for space travel and has various other properties. These creatures are known for their ability to sense vibrations in the sand, which they use to hunt. When disturbed, a sandworm can erupt from the ground, making them both awe-inspiring and dangerous to the inhabitants of Arrakis. Their presence is deeply intertwined with the culture and economy of the planet.