The Black market

Disguised as an abandoned warehouse in the most dangerous area of Touchdown, the black market area is a hub of illegal deals and espionage. If you need something, or need to know something, your needs will be filled in this place. The warehouse is at least four times the size of any normal warehouse known to us now. Each of the four doors are guarded by a huge specimen of various species. A password that changes twice a week must be given, or you will be launched to the other end of the satellite city. Inside is an open area with stalls and cloaked figures kneeled over blankets or leaning against walls. Those who come here must have the money, or the goods to pay. Otherwise, you are deemed a spy, and promptly find yourself sleeping with the fishes.

Now don't be silly--the location is not always the same. Not to mention there is more than one spot, but unless you happen to be a well known criminal, you are not getting any deeper in the network than this.