Global Collapse: Infinitely Upgraded Shelter

Global collapse. All humans will face survival challenges. Super radiation, high temperature heat waves, extremely cold ice and snow, terrifying beast tides, alien aliens... Build a shelter to start unlimited upgrades. Iron door-steel door-alloy door-titanium alloy door- Wooden walls—iron walls—stainless steel walls—alloy walls— Generator—Biogenerator—Bioelectricity accumulator—Bioelectricity nuclear— Robot—AI robot—Intelligent AI robot—Super intelligent AI robot— … This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.