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Seaworms on the cover of Sandworms of Dune.

Expanded Dune
This article or section refers to elements from Expanded Dune.

Seaworms are a genetically modified form of the sandworm. Tylwyth Waff created them, and released them into the ecosystem of Buzzell.

Waff modified some sandtrout to thrive in a watery environment when matured into worm form. The experiment succeeded beyond all expectation, and soon the soostone harvesting came to an almost-complete halt, as the seaworms were viciously territorial and killed many Phibians engaged in the harvesting.

When captured and dissected, an internal organ found in the seaworm contained a particularly potent form of spice, later referred to as ultraspice.

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