The Tunnel

The Tunnel is the second chapter of the fourth campaign, Blood Harvest.

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Encounter
In the Lower area of the house that you have to walk through there is an alarmed door that leads through the factory and onto some train tracks. When you open the door the alarm sounds and the Horde comes. Ammo is located next to the door as well as sometimes health.

There is a way to skip the alarm door Cresendo event. You must hit and move the crates directly under the vent in the ceiling, a box must be stacked on another for you to actually jump into the vent. Also, in verses if the player is a hunter, there is a invisble barricade. What it does is get close to the alarm door keep pouncing until you get to the other side of the door.

Afterwards
After defeating the horde here, the survivors emerge outside and enters the tunnel. Many trains have crashed here, creating obstacles the survivors must traverse. After finally passing all the trains the safehouse appears at the end of the tunnel.