The engineering team, led by a few lower-ranking combat soldiers, mounts a desperate assault on the bioweapon-infested Annex 1. The Terraformars attack at the same time, making for a disastrous 3-way battle.

The battle for the broadcast tower rages on as the civilian crew of No. 1 division infiltrates the control room. But the Terraformars are there too. If they make any noise the trained killers of No. 4 Division will hear them, so they're forced to continue their work in total silence as the killer cockroaches get closer.