New start, police sniper on the FEMA Camp scenario. I killed every zombie in camp by luring them into the burning building, pulped all the corpses, and thought I was doing pretty well. I had already found an entrenching tool off a dead zombie soldier, so I was able to use it to clear out the wreckage of the destroyed building all pulp the corpses inside.
Then I fell down a hole in the ground that was created by the collapsed wreckage
There was a lava rift directly underneath the FEMA Camp.
Burned alive in a river of lava within the first 3 in-game hours.