Mortal Survival in the Apocalypse

The progress of human exploration of the world is becoming more and more complete. The viruses in the ancient frozen city, the mysterious species in the underground city, the behemoths in the quiet deep sea, and the dragon heads in the clouds in the sky are all coming one after another with the outbreak of the apocalypse. No system, no plug-ins, reality, step by step, not a cool article. In the parallel world, chaos and radiation leaks occur in the world, inexplicable elements enter, the world changes drastically, the environment is polluted, and the civilized order falls apart. Only a few pure lands remain, and how can those who have been stripped of them survive?