This subject is related to the Combine era.

Quarantine Zone

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Quarantine Zone
General information

After the Seven Hour War


After the Uprising


City 17, Europe, Earth




Combine occupation



Game information

The Quarantine Zone, dubbed the QZ for short, is an area located on the outskirts of City 17 during the Combine occupation of Earth. Much of Half-Life: Alyx takes place within its boundaries.


In Half-Life, the rift opened by the Black Mesa Incident allowed alien flora and fauna from the Xen borderworld to infest areas of Earth. After their successful conquering of the planet following the Seven Hour War and the continuing worldwide effects of the Portal Storms, the Combine established the Quarantine Zone to keep Xen wildlife out of City 17. The zone houses a large number of Headcrabs, Zombies, and Antlions. Combine Infestation Control crews were sent inside to help combat the spread of the infestation, but they were evidently not successful as the infestation continues to run unchecked, and Barnacles and Zombies still manage to frequently escape from the containment area.

At the time of Half-Life: Alyx, the Quarantine Zone is said to have been deserted for several years by that point, but Alyx Vance had recently spotted the Combine moving supplies into it for unknown reasons. She ends up venturing into the zone during a mission to rescue her father Eli and eventually discovers the existence of the Vault, a large floating prison structure in which the Combine had seized an entire apartment building from inside the QZ to capture one individual within.

Major locations[edit]

Related Achievements[edit]

Half-Life: Alyx
Achievement Quaranta Giorni.jpg Quaranta Giorni
Enter the Quarantine Zone.

Behind the scenes[edit]

Unused loading screen text suggests there are multiple quarantine zones due to the Xen infestation manifesting in localized areas of the planet.

List of appearances[edit]

Preceded by
Russell's Lab
Half-Life: Alyx story arc journey Succeeded by
Vortigaunt Hideout