Sanctuary Pipeline

The Sanctuary Pipeline was a top secret hyperspace route established and maintained by the Galactic Empire after it used S-thread boosters to reverse the gravitational muddying which collapsed a former hyperlane. The route went directly between the planet Sullust and the moon of Endor and was used by the Empire to covertly supply its secret construction of a second Death Star superweapon.

After Galactic Emperor Palpatine allowed information on the new Death Star into the hands of the Rebel Alliance around 4 ABY, the rebels analysed the Sanctuary Pipeline and decided to use it to make a surprise attack on the superweapon, with Sullust being the staging ground for an amassing Alliance fleet. The Alliance forces then used the route to make their attack on the Death Star at Endor, only to find the Emperor had set a trap there with his own fleet. However, the resulting battle ended with the destruction of the superweapon and Palpatine's death regardless.

Text and facts from the “Sanctuary Pipeline” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.