8 Levels of Sewer

About
8 Levels of Sewer is a urban legend among TSR and other sewer groups. It's an alleged system where beyond a gate near the TSR, is an entrance to deeper and darker layers of sewer. TSR and it's many other rivals are considered to be level 1 on the sewers. It's a place you can simply just walk right into from a sewer entrance. However, the deeper layers are much harder to get to. The deeper you go, the more horrifying they get.

Nobody knows who built the lower levels of sewer. We do know why they maintain a gate with heavily armed guards in order to keep outsiders out form level 2. If a cat slipped in, chances are they'd never come back. And if the lower levels weren't guarded, there's a chance the "things" that dwell down there could escape.

Most cats think 8 levels of sewer is no more than a myth, but its real. If you manage to get into level 2, you wouldn't be very entertained. It's just a lot of guards and a few other things.

The concept of 8 levels of sewer is thoroughly explained in a short article you can read here.

Also, deeper layers contain a hostile organization called Chelsea's Speaking Room. Check it out.