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The sandworm was a native life-form of the planet Arrakis. It lived in the vast deserts and sand dunes that stretched across the surface of the planet. Simply put, the sandworm was an essential factor in the creation of the melange.
Sandworms lived beneath the sand. Attracted to rhythmic vibrations on the surface, they would breach in pursuit of the origin of such vibrations. This was an effort to defend their territory, of which they were highly protective. Thus to see a worm, and live to tell about it, was extremely rare, save for the mysterious Fremen, who had achieved some kind of mastery over the beast.
The Sandworm was the predominate lifeform on Arrakis, both honored and feared; vital and deadly. The sandworms were extremely territorial; as soon as two worms sensed each other's presence, they let out chuffing roars of challenge, bellowing melange-smelling exhaust from their cavernous throats.
By anyone's standards, Sandworms could grow to an enormous size. Dr. Wellington Yueh cited that specimens "up to 450 meters long" were spotted by observers in the deep desert. To make a comparison, the largest animal on earth was believed to be a Blue whale measuring in at only 33 meters, or about 12% of an average sandworm's length.
Many things commonly associated with Arrakis are surrounded in myth and mystery, and the sandworms are no exception. Some people believe that worms from 700 to even 1000 meters existed in the southern pole regions. This was neither confirmed nor denied. See Paul Atreides during his trial of the sandrider for further reading regarding their maximum observed size.
Due to the difficulty of studying these creatures, not much was originally known about the wild sandworms. The longevity of the sandworm was supposedly extreme, estimated in the thousands of years.
Their skin was thick, rough, and orange colored. It served the simple function of armor and was comprised of many scales, each a few feet in size. These scales overlapped and interlocked to form the armor that protected it against internal sand invasion.
As the Fremen discovered, this armor, while all but impenetrable, could be exploited. By prying open one or more of the scales, the integrity of the armor would be compromised; sand was now free to enter into the sandworms softer insides. This would cause intense irritation for the sandworm. The beast would then roll itself until the prone scale was at the highest point from the desert floor, thus minimizing the amount of sand that could enter.
A fremen poised to "ride" the beast as it rolled its open scale towards its highest point could literally mount the worm. As long as the scales remained open, the sandworm would not submerge. Maker hooks were then placed towards the front of the beast to control lateral movement. As a result, wormriding became a viable, even sacred, method of transport for the Fremen across the surface of the planet. Indeed, distances were even measured in "sandworms". A 20-worm ride would be a far, long and difficult journey.
A sandworm's internal workings resembled that of a massive blast furnace, producing intense heat and flames. This in turn provided the environmental link of supplying oxygen to the nearly plantless Arrakis. The mouth was positioned at the forward end of the creature and could easily consume gigantic objects such as spice harvesters.
The smell of the sandworm has been particularly documented. A strong, flinty, cinnamon smell exuded from the beast, especially from the mouth. Some said it could be smelled before seen. The presence of the spice melange was intense and so was its odor.
The approach of a sandworm towards its breach-point was often indicated by the dry lightning that frequently occurred in the area; a result of static electricity being discharged into positively-charged air.
The main component of the sandworm's diet was sand, and other inorganic and dry components of the Arrakis crust. It is also believed they sifted the sand-plankton for nourishment.
Water was fatal to a sandworm, even in small doses. Water that entered a sandworm's body would act as catalyst to accelerate its metabolism to the point that it became unstable and its life support failed. This was a violent and presumably painful death for the sandworm. It was necessary however, in so far that the byproduct of the sandworm/water mixture was the highly toxic poison called the Water of Life, which Bene Gesserit Reverend Mothers used on various occasions.
The process of sandworm creation began when sandtrout banded together after converging on a store of water deep beneath the surface of Arrakis. Indeed, water did occur naturally on Arrakis. However, due to the aforementioned process, it was always destroyed. The sandtrout/water mixture was then converted it into a liquid chemical that the sandworm was capable of digesting without being poisoned. On a side note, this chemical could erupt up to desert's surface in a violent explosion called a pre-spice mass.
The sandtrout that survived this event would then coalesce and complete the metamorphosis into a young sandworm.
Insofar as the sandworm was essential to the creation of the spice melange, on a macro scale the sandworm had an enormous impact on humanity.
To the planet's Fremen population, the creature was a spiritual symbol of their faith and saw them as physical embodiments of the One God of their original Zensunni religion. Within Fremen culture the sandworm had several additional names, notably The Maker and Shai-Hulud, which variously meant Old Man of the Desert, Old Father Eternity, or Grandfather of the Desert.
Young sandworms were used by the Fremen for special ceremonies. Inducting a new Sayyadina or reverend mothers was a prime example of the sandworms essential cultural role.
After the rise of the Atreides Empire and the propagation of the Arrakis-variant of the Zensunni religion across the known universe, the reverence paid to the sandworm spread to other worlds. This continued through the rule of Leto II, due to the fact that he had become something of a hybrid, both man and worm.
The terraforming of Arrakis posed a grave risk to the sandworm, which found life outside the arid desert fatal. The terraforming reversal process had begun by the end of Leto's reign, and he himself devolved back into sandtrout at his death. These events saw the sandworm once again thrive on Arrakis for approximately another 1500 years. During Leto II's reign some smaller sandworms were also removed and shipped off with colonizing vessels during the Scattering. This exercise yielded questionable success.
Death on RakisEdit
The hostile actions taken by the Honored Matres saw the termination of all life on Rakis, including, it was believed, the remaining sandworms. However, this was not before Miles Teg and Darwi Odrade had managed to capture a sandworm. Held in an artificial environment on Chapterhouse, the secret and temporary base of the Bene Gesserit Sisterhood, this worm would have been the key to re-seeding its population.
On Other Planets, In Other PlacesEdit
The first place that Odrade's sandworms began a new spice cycle was on the Bene Gesserit homeworld of Chapterhouse. After their introduction, the sand trout began to turn the once-lush world into a desert. Eventually, Mother Commander Murbella of the combined Gesserit/Matres group, The New Sisterhood, was able to pay for starships and other off-world materials with the melange that the worms produced.
Odrade's sisters also colonized the lush climate world of Qelso, and after only 30 years, the sandworms turned it into a very inhospitable place to live. Duncan Idaho's no-ship, the Ithaca, visited the planet as they fled from the Enemy. They tried to convince the inhabitants of Qelso they were fighting a losing battle, to which the natives did not agree. Later, when Duncan assumed his role as the combined Evermind and Ultimate Kwisatz Haderach, Idaho revisited the planet. He left sentient Thinking Machine robots with the gholas of Stilgar and Liet Kynes, to help divide the planet into lush areas and sand areas.
On the Day of Kralizec, when tantamount change came to the universe, the ghola of Leto Atreides II and Sheeana Brugh were left aboard the Ithaca as prisoners near the Cathedral on Synchrony. To disrupt the ordered pattern of life for the Thinking Machines and their rulers, Omnius and Erasmus, Leto and Sheeana released the giant six sandworms and their leader, Monarch, held in the Ithaca's cargo bay. The worms cascaded over and under the surface of Synchrony, in which they destroyed buildings and caused chaos and mayhem. After the banishment of Omnius and the sharing of Erasmus and Idaho, Leto decided to merge his cellular sturcture with that of the giant worms; in which he believed he fulfilled his role in the universe and his personality.
After Idaho gave Synchrony to the a combined custodianship of Bene Gesserit, Tleilaxu, and Thinking Machine overlordship, the worms still produced spice in a segregated portion of the planet.
A ghola of the famed Tleilaxu Master Tylwyth Waff produced a genetic variant of the sandworm, which thrived in water, called the seaworm. Under Guild guidance, and with their funds and technology, Waff introduced this changed worm into the seas of the water-world of Buzzell. These worms produced a super-potent version of melange called ultraspice in a liver-like organ in their body.
On Rakis AgainEdit
After Waff provided the Guild with the seaworms of Buzzell, he began what he considered his most holy mission—returning the worm to Rakis. He released a variant of the sandworm in the sands which had re-inforced armor-piercing appendages at the mouth of the giant creature. Waff's attempt to re-seed Dune with these creatures failed, as they died over the period of a week.
On the Day of Kralizec, as Waff was about to give up in futility, he heard a deep rumbling far underground. Sandworms, with the consciousness of Leto II, the Tleilaxu Prophet within them, burst forth from deep underground the planet. It had turned out that the worms had survived the Matres bombardment forty years earlier, and would thrive again on the world.