Global Doomsday: Build a Shelter at the Start

The original world collapsed and the wasteland world came! Meteorites attack, beasts mutate, the old days come, no one can escape! Only by building shelters can we survive the baptism of natural disasters one after another. And Fang Mu, who traveled through time, awakened the doomsday shelter system! Fusion weapons, technological blueprints, protective walls, mechanical armors, and countless high-tech products were traded from his shelter, shocking the Federation. When people were exhausted and in tense confrontation with the ferocious beasts, Fang Mu's shelter had become as strong as a fortress, and even sent soldiers to rush into the void to pry into some unspeakable mystery... Facing the interview, Fang Mu could only spread his hands helplessly: "I just... Had better luck when opening the treasure box..." (The introduction is too weak, please move to the text to read)