Eventually, the duo manages to find the exit of an underground train station and Gordon and Alyx come up to the surface, observing the citadel from afar, and the destruction already visited on City 17. Dr. Kleiner appears on the screens that Breen used to pass out propaganda, mentioning that the Suppression Field, which had previously prevented human reproduction, is down. As the duo moves on, they engage in several fights with Combine soldiers, Antlions, and zombies.
Alyx and Gordon finally meet up with Barney Calhoun and a group of other survivors who are preparing to move on a train station in order to escape City 17. With the Combine still following, Gordon and Alyx split up from the group and move through a derelict hospital to draw the remaining Combine forces away from the refugees. Inside the hospital, Combine forces and zombies of all kinds are fighting throughout the collapsing structure, and hastily constructed defences to slow Alyx and Gordon down.
