All of this is thanks to the new materials brought by the planetary impact. Humanity survived once again, and afterward, they divided themselves into cities, each within a vast isolation wall, gradually restoring their ecosystems to allow for human survival and reproduction.,One day, a certain city released a video from several decades ago. Finally, humans understood why that explosion occurred, the one that changed all of humanity.,"Alright, alright everyone, there's no need to panic. We'll definitely wait until it's absolutely safe before supplying the middle and upper levels. When the time comes, thank you all for your hard work. Lunch is already prepared, please..."。