The first layer, down an old escalator, turns to a toll station with a gang of four. After that, a little way forward will go into an are where three victims are arguing. Going to the left and under a grating will enter an area on a track with many non-hostile cannibals.
In one instance, they encounter cannibals, most of them non-violent. I climbing across the infamous Gap. Traveling past the cannibals, the Gap, a large "crack" in Haventon caused by the initial earthquake, awaits. Crossing the gap leads into Line 2.