Upgrading the Underground Bunker

Alex was eager and quickly rushed back to the underground bunker.

At this moment, the underground bunker was covered with S alloy on the foundation and walls, forming metal rooms.

And after upgrading to the mid-level underground bunker, it could activate properties such as cold resistance, heat resistance, and lightning resistance.

Only after upgrading to the mid-level underground bunker could it be considered a strict refuge.

After all, the villa where Alex and others lived could only withstand zombies.

Building a basic underground bunker could only withstand meteor showers.

If there were extreme disasters in the future like magma rain or snowstorms, they would need a mid-level underground bunker.

Although there were no signs of magma rain or snowstorms at present.

Prevention is better than cure, so upgrading early also eliminates worries.

Alex opened the information panel of the underground bunker.