Chapter 6
This is a pretty short chapter if you just are playing the main chests.
Make your way over and talk to Joseph, you will need to follow Joe and head into the sewers. You will need to protect him as you make your way to and through the sewers.
Make your way up the ladders and turn off the valves for the water, you will then need to make your way back to Joseph and you will need to make your way up the ladders to the control room.
Have wonder through the areas and pick up some goodies.
Once you have activated the controls, you will need to take out the massive fat zombie! You will need to watch out for the puke from the zombie, take him on with brace knuckles if you have any.
Once you have made your way through the sewers you will arrive at Chapter 7 of Dead Island.