Wasteland for All: I Build an Underground Fortress

"Shanghai, June 25 (This newspaper) - Unidentified flying object enters the solar system..." A mysterious flying object descends, plunging the entire population into a wasteland, mired in a death trap! Deadly eternal nights, eerie poisonous rain, extreme cold storms, and despairing pollution... Natural disasters strike frequently, leaving no one unscathed; survival and development become the main themes! Only by building shelters can they withstand the relentless onslaught of destruction. Fortunately, Luo Yuan awakens the Doomsday Construction System, step by step transforming the shelters into impregnable underground fortresses! [Wooden Planks] - [Stone Door] - [Iron Door] - ... [Ventilation] - [External Circulation] - [Dual Circulation] - ... [Rudimentary Shelter] - [Wooden Shelter] - [Stone Shelter] - ... While others are still struggling, he has already begun to enjoy life, possessing his fortress and looking down upon the wasteland! "What? The monsters can't even get through Brother Luo's door?" "I heard..."