The weather has taken it's toll; where before running water carried refuse through the sewer, now it flows around and between piles of built-up... nastiness. The result is much like trudging through a compost pile, but the group can see that there is a path, of sorts.
Eventually the grate is reached, and passed through and the Kindred climb up into The Fishbowl. It's a massive room for collecting water; steps lead out to a walkway that leads to scaffolding. There's also another huge drain pipe. Essentially, they've just climbed up and out of the sink drain.
Or toilet. Depends on if she's a girl who see's the glass half full or toilet half flushed.
Posts should address how each character is seeing in the darkness; The Fishbowl is lit, but the connecting tunnels have not been. Also feel free to address the sewage however you will.