Apocalypse Descends: My Shelter Can Be Upgraded Without Limit

The apocalypse arrived. Freezing cold and scorching heat. Earthquakes and acid rain, gales and hailstorms. Floods and monsters, viruses and zombies. Sunspots and radiation. Calamities struck one after another, and humanity’s survival hung by a thread. Su Muchen built a family shelter to escape the disaster and gained the ability to “upgrade anything.” To survive the apocalypse, he used his power to upgrade the shelter one step at a time. Reinforced concrete walls → cast iron walls → high-strength steel walls → alloy steel walls → titanium alloy walls Generator → biological generator → bioelectricity storage and release unit → biological nuclear power Robot → intelligent AI robot → intelligent AI robot → superintelligent AI robot Protective suit → exoskeleton armor → mechanical armor → small mech → giant mech Brain development: 20% → 50% → 80% → 100% Cell activation: 10% → 30% → 70% → 100% Before he knew it, a godlike, invincible, hyperdimensional realm of technology had risen into the world~