End of the World: I Use Alien Technology to Build a Shelter

[Time Travel] + [Zombie Apocalypse] + [Multiple Disasters] + [No Heroine] + [Decisive Killing] + [Alien Technology] At the beginning of the journey, he was abandoned by the search team in the icy and snowy environment due to serious injuries and weak body. He struggled to survive into the mountains and used an alien technology ring to build a prototype of a god-level shelter. I wanted to lie down, but I learned the truth about the end of the world and the dangers I would face in the future. I could only keep going out to collect supplies, improve myself, and upgrade my base, but unexpectedly I became the only hope for the world. This is a story about remaining anonymous and developing in the early stage, and then cooperating with various forces in the middle and later stages to fight against the ultimate villain and save the world.