The guidance stations near New Port City need maintenance after a long rotation of shifts, and you are the one doing it. Load up the Massive Self-Sustaining Installation Repair Truck — MSSIRT — and drive out to the last stations on today's list with the crane attachment ready to go. The job is almost done when a distress signal comes in from a nearby sector. Following it begins a sequence of discoveries about the world around New Port City that the repair work never hinted at.