Undercity sewers

The Undercity sewers was a waste-management complex in among the lowest levels of planet Taris, which was sandwiched between the Undercity surface and the underground city, known as the Promised Land. Built before the Tarisian Civil War that occurred a century before Jedi Civil War, these sewers encompassed two levels of large drains and reservoirs. Over time, a lack of proper maintenance culminated in the facility's severe state of operational disarray as of 3956 BBY, by which time its lack of supervision had also left it riddled with criminal elements from the Tarisian lower levels.

By 3956 BBY, when Sith forces under command of the Sith Lord Darth Malak has taken the control of the planet's upper levels, the Black Vulkars gang of the residential area above the complex, had secured the upper level of the sewers with mines and ray shields to ward unwanted visitors from their headquarters. Meanwhile, the lower level of the dilapidated structure housed a band of Gamorrean slavers that competed with dozens of feral victims of the rakghoul plague.

When the amnesiac former Dark Lord of the Sith Revan came to Undercity searching for the Jedi Knight Bastila Shan, whose crashed escape pod were found nearby, he entered the sewers with a teenage Twi'lek named Mission Vao as his guide to the Vulkar camp in exchange for assisting her attempt to rescue her companion, Zaalbar, who had been taken captive by the Gamorrean faction. After the Wookiee was freed from slavery, Vao ushered Revan through a secret entrance into the gang's base per their arrangement.

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