Sullust Sullust was a planet located in the Sullust system of the Outer Rim Territories that was home to the Sullustan species . Description . Sullust was a barren , obsidian world of lava streams and turquoise lakes . Native fauna such as ash angel s foraged during the day and returned to nest at night , while rockrender s prowled the planet ' s underground . Because the planet ' s atmosphere was highly toxic , native Sullustan s lived in technologically advanced subterranean cities that were highly regarded for their beauty . They commuted to work by lifts and shuttle s that carried them to the factories on the planet ' s surface , alternating between day and night shifts . The SoroSuub Corporation employed roughly half the population of Sullust . History . During the Republic . In its earliest days , Sullust was a proud and influential member of the Galactic Republic , and was host to the Sullust Sector Spacefarers Academy that young Wilhuff Tarkin attended . In the years following the Invasion of Naboo , the rogue Jedi Count Dooku spread political turmoil on worlds such as Kashyyyk , Onderon , and Sullust . Sullust subsequently seceded . During the Clone Wars , it hosted a battle between the Republic and the Confederacy of Independent Systems . Imperial reorganization . The planet eventually came under the jurisdiction of the nascent Galactic Empire following the proclamation of the New Order , and was reduced to vassal status and a source of fuel for the Imperial Military , becoming an essential mining and manufacturing center for the Empire . By 18 BBY , the Empire already had an established presence on Sullust . For years , Sullust remained relatively peaceful as workers accepted the stability offered under the Empire ' s reign . However , the Cobalt Laborers ' Reformation Front steadily began to increase in numbers , sending letters to the Imperial governor demanding better working conditions and increased local autonomy . In response , the Empire detained roughly eighty percent of those in the organization and those it deemed most radical . Imperial occupation . Shortly after the Disaster of 0 BBY , an enclave of Alderaanian refugee s took up shelter on Sullust , hoping to escape Imperial reprisals against the remaining population of Alderaan . After the Battle of Hoth of 3 ABY , the Imperial Security Bureau began to suspect the Cobalt Laborers ' Reformation Front of harboring rebel sympathizers and material for a possible resistance movement . The group claimed to have no connection to the local Sullustan resistance on the planet , but that did not stop the Empire from locking down the city of Pinyumb following a pipe bomb explosion in a nearby manufacturing facility . Weeks later and shortly following the Battle of Hoth , the Rebel Alliance initiated Operation Ringbreaker , which sought to force Imperial redeployments from the shipbuilding world of Kuat by assaulting worlds such as Obumubo , Naator , Xagobah and the asteroid mines of the Kuliquo belt , thus allowing for the Alliance to assault its ultimate goal . When the Alliance Sixty - First Mobile Infantry jumped out of hyperspace a mere half million kilometer s from the planet in an effort to rapidly deploy drop ships to assault the Inyusu Tor mineral processing facility , the attack ultimately went awry the following day when the Imperial Vixus Squadron ambushed their troop transport s , stranding the company on the planet . The next three days would result in the bloody Siege of Inyusu Tor , initially being in the Empire ' s favor as the " Imperial " - class Star Destroyer " Herald " arrived in the system and the Imperial Army utilized overwhelming force to surround the rebels on the mountain side facility . However , after receiving aid from the local resistance as well as finally convincing the Cobalt Front to rise up in Pinyumb , the Imperials were overwhelmed , while subsequent uprisings across the planet ultimately liberated it from Imperial rule . In the following days , an interim government was installed in Pinyumb , while heavy losses sustained by the Sixty - First ultimately canceled Operation Ringbreaker , allowing the company to act as a temporary police force for the Sullustan people . Subsequent pirate broadcasts and intercepted Imperial signals indicated further insurrections across the planet , delaying the inevitable Imperial counterattack . Regrouping over Sullust . By 4 ABY , the Rebel Alliance used the planet as the staging area for its fleet prior to the Battle of Endor . The New Republic . By 28 ABY , Sullust was represented in the New Republic Senate by the Populist senator Anib Ney . Behind the scenes . Sullust first appeared in the Nintendo 64 game " " , but its first canon ical appearance was in " " . The planet ' s subsurface was depicted in the " " comic . Its surface as depicted in " Star Wars Battlefront " was based on . Doug Chiang said DICE proposed the look , and Lucasfilm agreed : DICE ' s Audio Director Ben Minto recorded various sounds in Iceland , including bubbling mud pools , shrimp and cod grunts ; or huge steel guy - wires from the .