Terrorists in stolen guardian uniforms have seized the city waterworks. Eighteen gunmen protect two technical specialists: one is preparing a five-minute poison transfer, while the other is breaching the emergency valve vault in roughly two and a half minutes. If either specialist falls, another hostile can continue only by reaching the same controls. A Global Hawk pass will map all twenty occupants, the injection machine, the vault, and the backdoor supply pipe before insertion.

Stop whoever is operating the poison controls or isolate the injection machine before transfer completes. If poison is released, close the municipal valve before its vault is breached. If both protections fail, demolish the marked backdoor main. Every successful route ends with a counterattack and reinforcement hold; eliminating all twenty is not required.