Thinking of this, Ike immediately went to check the wall outside the shelter.
The wall material had been upgraded several times. It could resist all kinds of disasters and had a good anti-corrosive performance.
But just in case, Ike still strengthened the anti-corrosive performance of the outer wall.
"System, upgrade outer walls and doors, to enhance the resistance to acid rain." Previously, Ike had used a lot of special compound materials to the anti-corrosive properties of the protecting walls. Therefore, if he wanted to continue to upgrade, he would need more advanced materials, special meteorites.
"Upgrade succeeded!"
This time, the upgrade consumed a lot of Ike's special meteorites, but the anti-corrosive properties of the outer walls and doors of the shelter had been greatly improved.
It was enough to deal with the erosion of the corrosive rain.