The Sewer

The Sewer is the third chapter of the first campaign, No Mercy.

In this chapter the survivors begin in a safe room with the usual tier 1 weapons. Upon leaving the safe room, they make their way to an old warehouse, usually housing a  tank. In order to enter teh warehouse, the survivors must activate a lift which is noisy and attracts the horde in a mini-finale. To teh right of the lift is a gas station; the gas station explodes, killing anything underneath it and incapping nearby survivors. Special infected nead to be directly underneath it to die, otherwise it merely knocks them back. After fighting through a storage room and reaching the generators, the survivors then go through a man-hole to reach the sewers (usually with a Witch). A labyrinth of sorts, the sewers house usually between 2-3 hordes (dependent on difficulty) and one more  tank. After fighting through the sewers, the survivors emerge across the street from the hospital. After fighting through another horde, the survivors can then enter a  safe room at the base of the hospital (sometimes housing a  tank).