The filtration module of District Seven in the enclosed underground habitat is damaged, and the main front of the 'White Tide' will arrive in 32 minutes. 1,800 residents of District Seven face severe air risks, while the remaining six districts can only maintain long-term life support for 10,600 people in their own districts. Ordinary partition doors cannot be opened directly due to pressure differences, and even at full capacity, the dual purification chambers cannot save all residents. Air engineer Su Jianwei discovers a sealed emergency air duct connected to the agricultural dust-washing tower, but activating it requires first completing physical isolation of industrial water and raw water, preservation of mother seeds, tower load verification, and obtaining public resource authorization from the entire city for agricultural production suspension and food ration adjustments.