https://wccftech.com/new-call-of-duty-zombies-outbreak-details-emerge/

Call of Duty: Black Ops Cold War Season Two brought a new Zombies experience: Outbreak.

This expansive new option for Zombies fans is an objective-based experience that takes four Operators and tasks them with coming to Requiem's aid during a major undertaking called Operation Threshold, set in the Ural Mountains of Russia.