Jacinto was a major COG city and one of the last bits of land where humans could hide from the Locust due to its impenetrable granite base: Jacinto Plateau. Fifteen years after Emergence Day, when the Locust started sinking entire cities with a giant Riftworm, the COG got nervous that Jacinto would be next. Through Operation Hollow Storm, they decided to quickly strike at the Locust's home--The Hollow--by accessing it via grindlifts. Unfortunately, Delta Squad eventually discovers the only way to destroy the Locust's home is to sink humanity's last refuge–Jacinto. They accomplish this by blowing up a Lambent Brumak under the plateau.