Doomsday Cataclysm: Upgrade the Doomsday Ark at the Beginning

Catastrophe is coming, and huge ice meteorites are about to impact the world, but this is just the beginning. A huge tsunami, a large number of biological changes, the eruption of ancient caves, ferocious beasts running rampant... This world has begun a catastrophic evolution... And when Shen Fei traveled to this world, he was about to face the end of the world! Fortunately, he got the system and built his own ark, which can be infinitely upgraded! Ark strength → Level 1 resists normal attacks → Level 2 small-caliber weapon attacks are ineffective... Ark Arms→Small-caliber machine gun muzzle→Ship-based machine gun→Ship-based laser weapon.... Ark Structure → Research Laboratory → Greenhouse Breeding Room → Weapons Room.... Radiation protection suit → exoskeleton armor → mechanical armor → small mecha → giant mecha... In order to survive, he can only wear a super mecha to find supplies. "Woc! Alien mechas invaded?... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.