Exploring the sewers | The Hound Pits Pub #3 Dishonored Guide
Last update: 11 May 2016
New Main Quest: Investigate a disturbance in the sewers
Use the key to open the manhole located nearby and jump down to the sewers. Start exploring the small location and follow a linear path. It's also worthwhile to look around for gold and food.
After you reach the end of the sewers, it will turn out that the pub's denizens were right, since the area is occupied by weepers. Weepers are people who were infected and have behaved like zombie ever since. It is worth noting here, that weepers are not treated like monsters, and therefore, killing them contributes to worse quest statistics. Since you need to neutralize them and not kill, in this case, I recommend using sleeping bolts (the above screenshot) and try to get the weepers from behind.
I recommend that you watch your steps, because the weepers will attack you if they spot you. In case you are grabbed (the above screenshot) I recommend pressing the left mouse button regularly. Regardless of the chosen approach, you need to remove weepers from the sewers.