The underground network is the true shooter's level, patrolled by an unknown clockwork militia. Golems mass produced and magically activated, the Learner's ability to knock out their ghost in waves is very useful here.
The roughly clay packed gear-works for bodies are sensitive to shots in the joints. Their targeting is adequate but are incapable of properly lining a shot on moving targets. Easily frustrated and likely to throw grenades as the last attempt.
The Midwich underground would have been constructed first then the town on top of it, tunnels connecting all the major buildings. Surprisingly competent works for what's so far been seen.
Suspicious.
This opening leads directly out to the docks through the warehouses, where cargo is only prepared for going out, loading onto ships which came empty.
The other direction through the tunnels the sewers connect, passing the outflow generators powering the town;s weak lights, and pouring out into the valley.
They examine the outgoing cargo. These tunnels are made to be cleared, my personal preference to levels which offer multiple ways to get to things amid already set patrol patterns.
The Learner lowers binoculars.
Learner - "What are they moving ?"
...
Killer - Looking with the goggles zoomed, "Looks like ... provisions. Like ... food."
Learner - "That's it ?"
Killer - "Looks like. Food. Wares. Some damn livestock even. But nothing ... there's nothing strange here at all ... "
Learner - "Well that's strange in of itself. So ... they ... must be stopped ?"
Killer - "I guess ... what's the map have to say about all this."
Learner - "Cuts off at the first layer of Hell."
Killer - "You didn't list that upstairs."...
Learner - "Do you really want save these people ?"
Killer - "Which ones ?"
Learner - A giggle, "Any of them. The ones we like."
...
Killer - "I do."
Learner - Smiles, a hand over the hand. "Then we're going down."