Doomsday Vault 0

Cheng Jian, a 29-year-old programmer, discovered a global climate data set called "Finish Line" on GitHub. After running it through an algorithm, he came to a cold conclusion: civilization will begin to irreversibly collapse in 90 days. No one believed him. So he stopped explaining, drained all his savings, reinforced the basement with vacuum insulation panels, stocked up on five years of rations, built a hidden solar array, and built himself a "No. 0 Shelter." The end is really coming—not an explosion, but silence. He thought he was ready, but found that he could not calculate the human heart despite all his calculations. When there was a knock on the door, when the retired neighborhood committee director used a handwritten list to restore order, when Doctors Without Borders renewed their oath on the ruins, and when a military mission called "Shenhuo" searched for surviving technical experts, Cheng Jian finally realized: the real fortress is not the wall that can withstand the explosion, but a group of people who choose to stand together. From a person's basement to a communication network covered in ruins, this is a story about ordinary people moving from self-isolation to illuminating each other.