Global Catastrophe After Radiation, I Use Zombies to Build Infrastructure

A certain island went its own way and discharged nuclear wastewater regardless of the opposition of the whole world, polluting the entire earth! Sea water is pouring back, biological mutations, zombies are sieging the city, and mankind is in danger... Su Xuan was reborn and returned to the day of the discharge, awakened the apocalyptic survival system, and started to build a shelter! This time, he wants to make an island pay the price and return a peaceful place to mankind...