I Built an Underground Noah's Ark

Earth falls to alien invaders in 2033—but Ye Linsheng gets a second chance. Reborn in 2025 with only two years before humanity's extinction, he faces an impossible choice: fight a technologically superior enemy or save what's left. His answer? Go deeper than anyone thought possible. Ten thousand meters beneath the surface, he'll construct humanity's last sanctuary—an underground ark where civilization can endure the coming apocalypse. Time is running out, and the aliens are already watching.