You proceed with Jen to the Ratway of the city, which to no surprise, is full of rats.

That being said, you can see a few fresh and not-so-fresh corpses down here of wenches, merchants, even the occasional noble as you walk through the rancid and fumigated sewer. Jen is uncaring of the smell, surprisingly.

It's at a certain point in the sewer when you hear the cheers of high pitched underdark dwellers. Sounds like people.