Day 4: Case 7

The safe house will be flooded with zombies. Several of your survivors will try to defend the area, mainly the "free" survivors from the start of the game. They can die off if you take too long finishing your objective. Gather up the three parts needed to close the door and hook them up. Press the button on screen and the door will eventually close off. Don't worry about extra zombies, as they will clear out.

Hand TK zombrex to save him from turning undead. It might seem like a pain now, but it will be worth it later. If you are out of zombrex, remember that there are four cases around the casinos.

Head to the underground and locate the giant blast door under the Atlantica. Enter through this door and you'll discover queen harvesters. Shoot down the guards with their own guns or just use melee attacks.

Explore the base a bit deeper and you'll encounter two scientists with pistols. Equip the B.F.G. on the right wall and use it take them down. The B.F.G. doesn't do direct damage, but will cause humans to vomit and be stunned for a short time. Use this time to murder both the scientists. Head back to the safe room to uncover the truth.