The Undercity is part of the city of Consensus, and is located underneath its harbor. The Undercity is home to a number of aquatic species.
Among surface-dwelling species it has the reputation of lawlessness, mostly due to the fact that the guards of Consensus, who are mostly Turian, don’t have the means to breathe underwater, and therefore cannot enforce laws there. In truth, the Third Wave and Tower Guardians do enforce laws there, but there are several criminal organizations that make their home in the Undercity.