My Doomsday Base Can Be Infinitely Upgraded

Meteorites fall, global volcanoes erupt, polar icebergs melt, sea levels rise rapidly, volcanic ash covers the sky, and the Ice Age comes... Shocking disasters are coming one after another. Is human civilization about to become extinct? Yang Li traveled to this doomsday wasteland world and obtained the civilization fire propagation system. "Upgrade the base wall!" Cement walls... Thick all-steel walls... Carbon fiber high-strength exterior walls... Super alloy fully enclosed shells. "Upgrade base defense!" Urban crossbow... Fully automatic machine gun... Gatling... High-speed automatic howitzer... Laser aerial cannon. "Upgrade base energy!" Hand-cranked generator... Diesel generator set... Biogas power station... Fission nuclear reactor... Fusion nuclear reactor... Stellar nuclear reactor. "Upgrade the base engine..." Yang Li faced the 100,000 people in the base and waved boldly, "Start to the stars and the sea!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.