The world is frozen: I built a doomsday fortress

The world has entered an ice age, the Ice Apocalypse has come, and 95% of the human population on the planet has died! In the last life, Zhang Yi was killed by the people he helped because of his kindness. Reborn one month before the Ice Apocalypse, Zhang Yi awakened his space powers and started hoarding supplies crazily! Lack of supplies? He directly emptied a super shopping mall's warehouse worth tens of billions! Are you feeling uncomfortable? He built a super safe house worthy of a doomsday fortress!