Exploring the first part of the sewers | Mission 7 - The Flooded District Dishonored Guide
Last update: 11 May 2016
Go ahead. After you reach a larger area, go straight. Stop when you encounter a wounded bandit And listen to him. The man will send you on an errand to find Slackjaw, who is in the possession of the sewer master key.
New Main Quest: Find the Sewer Master key
Explore the area to find some ammo, and jump onto the red pipe to get to the neighboring area of the sewers. There are a couple of linear tunnels ahead of you.
Watch out for river krusts, that you will encounter in one of the further parts of the sewers. Since you do not need to remain silent here, you can use your pistol, or grenades, to eliminate them. Do not forget to loot the bodies afterwards to find gold. In order to reach the next area, you need to smash the boards shown in the above screenshot.
Carefully, approach the bodies and, at the same time, eliminate the river krusts that appear up ahead and to the right. Before you go any further, explore the room to the left (the above screenshot). In here, you can find a note (Jelly's Next Task) and a book. If you read both of them carefully, you will be able to arrive at the combination for the safe here - i.e.528. Inside the safe there is a bar and a bone charm.
Return to the fork, and take the other path. Just like before, I advise against hurrying up, because there is yet another pack of river krusts. After you eliminate them, jump into water and dive in order to use the underwater tunnel (the above screenshot).
There is a long way through to swim so do not stop anywhere. Notice that on your way, you can use a small hole (the above screenshot), where you can draw some breath (and collect bolts). After you replenish your breath bar, go on swimming through to a new area.
Find the stairs here and go towards the upper floors of the metal structure. On your way, it is a good idea to look around because there are gold, ammo, a grenade and a spring razor to get here. At the end, go towards the gate shown in the above screenshot. Proceed on to a large cavity, where you will have to make an important decision.