On January 1, 2022, doomsday came to the earth, and the whole world would be exterminated.
Jack was accidentally reborn three months ago.
Knowing that the end of the world was coming, he immediately began to build a refuge.
He also activated the Doomsday Survival System, which could help him constantly upgrade his refuge.
The bulky iron door had been upgraded to a titanium alloy fire-resistant insulated door!
The brick concrete walls had been upgraded to special space metal walls!
The power system, pipeline system, material storage system, and active defense system had all been upgraded.
Jack's refuge was as complete and elaborate as a space station!
When the other survivors were still struggling to survive in the ruins of the apocalypse, they suddenly saw a huge refuge.

When Doomsday Comes, I Can Upgrade My Refuge Infinitely

After Jack and Annie chatted for a while in the room, the central warning of the underground city suddenly rang out loudly.


Alice's voice came from the central broadcast again.


"The survivors and the armed men gather at the stone gate in two minutes. Mutants are digging the wall again!"


Because the rule was related to the life problem of all the survivors, Alice read it three times.


Annie, with a smile on her face just now, immediately picked up the p90 pistol on the wooden table.


"Jack, wait for me here. Take good care of yourself. I'm going to deal with the mutants. I'll be back soon!"


Annie didn't have time to explain too much to Jack. She put on the thick combat suit and went to the battlefield.


Obviously, this had happened more than once.


Chapter 62 The Invasion of the Mutants