Global Catastrophe: I Use Black Tech to Build a Super Shelter

We have only traveled half a month, and the end of the world has arrived! Li Tian looked at the red alert and almost crushed the sofa. He just wanted to copy the novel and lie down to win. Will the world end? Fortunately, the doomsday black technology system was activated! It took six hours to dig a 4,000-square-meter underground shelter, with memory alloy welded walls and space expansion gun reinforcements to withstand meteorite impacts and nuclear explosion radiation. Unlock the clone manufacturing cabin and build three top special forces in Japan; with the super 3D printer in hand, any missing parts can be printed in seconds! After the meteor shower, the world froze, radiation spread, and order collapsed. Li Tian led the clone team to stock up on food and oil, but while searching for supplies, he bumped into three sisters who were freezing to death. Should we take in the team, or hold the fortress alone? To survive in the apocalypse, hard fisting is the way to go!