Impressive as Coruscant’s shining towers are, they could not exist without the less-glamorous Works, the heavy industrial complex deep below in the lower levels. The Works is home to Coruscant’s hydro-supply stations, pollution-processing plants and electrical generators, staffed by droids who can survive accidents in the Works’ dangerous machinery. Some of Coruscant’s more desperate homeless hide in the Works, tapping the pipes for water and sleeping under the power conduits to keep warm. Occasionally they will break a major pipeline, causing blackouts and water shortages on the levels above. One Senator, while demanding harsher penalties for vagrancy, found his water supply mysteriously cut off forty times in a month.
The Works is a large labyrinthine place, and no one has fully mapped it either. Even the government doesn't have a complete or correct map of the Works, as new layers, tunnels, and rooms have continually been added on for thousands of years.
Droids take care of all the maintance-work, and the wretches of society can be found within these tunnels... as can dangers of various sorts. The Works is host to numerous urban legends, rumors, and stories of various sorts, ranging from buried treasure from the early days of the Republic, a colony of intelligent Rakghouls, sentient droids controlling the power of the entire planet, and secret passages leading to places like the Jedi Temple and the Senate Rotunda.