Nuclear wastewater leaks, a meteor strikes, and the countdown to doomsday begins at thirty days. Xiao Feng, a student at Yanjing University, is trapped in an abandoned chemical plant. Supplies are scarce, and mutated creatures are closing in. By chance, he obtains the god-tier Shelter System, which lets him build defenses, upgrade technology, and stockpile resources. Fifty machine-gun turrets go up in an instant, and alloy gates seal off the base. While everyone else struggles to survive, he has already built an iron fortress. The water purification system starts up, seeds are planted in the underground farm, and the gravity training room opens. As shelters around the world fall one after another, his base remains impregnable. With the System in hand and every step carefully planned, he will eventually build a cross-dimensional ark of civilization and preserve humanity’s last spark.