Half-Life 2: City 1 Uprising

CITY 1 — ZAGREB OCCUPATION After the Seven-Hour War, the Combine occupied Zagreb, Croatia. The city was renamed City 1 and placed under human administrator Pavel, who claimed cooperation was necessary to protect civilians. The Combine divided Zagreb into sectors, including Upper City, Lower City, Novi Zagreb, the Sava Industrial Zone, and Medvednica. Civil Protection maintained order while Overwatch protected important Combine facilities. At the center of City 1 stood the massive Citadel, built over the old metropolitan center. Beneath the city, the Combine discovered Project Zagreb, a secret research facility created before the war. The facility contained a mysterious energy signal known as the Zagreb Signal. The Combine believed it was extremely important, but its true origin remained unknown. Meanwhile, the Zagreb Resistance formed in Novi Zagreb, using abandoned tunnels and hidden facilities to fight the occupation. Years later, a massive blackout disabled Combine communication