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At the end of the 25th century, due to frequent solar activity, there was a serious shortage of water resources on which human beings depended for survival. They could only survive by organizing the masses to recycle water resources. In the middle of the 26th century, more serious air pollution emerged, and humans could no longer endure the pain of hypoxia. They agreed to move underground to create a new air environment; in the early 27th century, powerful mysterious underground creatures began to attack and expel humans. After negotiations failed, they were allowed to use nuclear weapons to fight back; in the middle of the 27th century, high-level officials solemnly announced: the earth's energy is completely exhausted and the end is imminent...