Welcome to the Underground, a place that although is known about by police, even they won't try to touch anyone there.
In the Underground, there is illegal street racing available along with organized street fighting tournaments. And for driver's that participate in racing have The Pitz available, an area for mechanics to work on cars.
However the darkest part of the Underground is where they deal in slaves. Although the slaves aren't treated completely terrible, as they need to make sure that they're in good condition, they are sold to people for every reason imaginable...