Jacinto Plateau is the only secure fortress for the humans, from the Locust Horde. The Locust couldn't manage to use Emergence Holes with the Corpsers because of the organic terrain that penetrated them. Eventually, the Locust progress using their advance digging technology and accomplish their invasion into the Jacinto Plateau. With the fortress invaded and turn into another hostile combat zone, the humans have no where else to run. The Locust can use emergence holes all over the land of Planet Sera. In Gears of War 2, the Locust planned on destroying Jacinto by eliminating all from underneath it. Delta Squad discovers this, but they intend on allowing it. They need to do it before the Locust evacuate the scene, that way, all the locust below Jacinto will be die on the while Jacinto falls apart. Their plan work thankfully by destroying the Lambent Brumak with the Hammer of Dawn.