Global Cataclysm: My Doomsday Fortress Can Be Infinitely Upgraded

[Easy + System + Full Text No Abuse + Versailles] Qin Jian, who travels through parallel worlds, was told that there is still a week to usher in the "end of the world"!

Meteorite impacts, virus spreads, and during the Ice Age, all kinds of experts speculate that it is conclusive that mankind is about to face catastrophe.

Fortunately, he has bound the Doomsday Fortress system and has his own exclusive shelter. Every time a layer of fortress is unlocked, he will get all kinds of black technologies!

The first layer: light weapons production table, equipment production table, food production table.

Layer 2: Heavy weapon production table, tactical throwing object production table, trap production table

The third layer: Chariot Science and Technology Institute, Aviation Science and Technology Institute

Layer 4: Institute of Mechanical Sharp Soldiers, Gene Enhancement Bank

In addition, anything in the shelter can be upgraded infinitely!

When the super shelter composed of thousands of people is besieged by monsters and the sky is not visible, Qin Jian is already fully armed, stepping over the monster's corpse, and being alone in the supermarket, worrying about choosing today's ingredients.

(PS: In the early days of this book, the reckless man was reckless, and the protagonist rarely lingered in the shelter.)

Main characters: Qin Jian, Jiang Yingxue,