After a short drive east to Monroe Harbor (because I just know you aren't heading to the Pier... right?), you take the truck down to the ice. Gotta be nice, cruising along in this thing instead of the long walk, right?
You reach one of the few catacomb-like tunnels to the surface, park, and head down. Where did you pick, Silica? Heading through the Underlake Mines? Making a beeline for Market?