One Last Chance

This story is about humanity raging a 3rd world war so large, that it eventually leads to a nuclear fallout that kills 98% of humanity, so the remaining survivors, (being the most powerful and wealthy), build a large space-ship under ground that takes 20 years to make, with the population increasing rapidly. They abandon Earth in search for a new world to colonize. It takes 300 years to eventually find a new planet that humankind could never have known of on Earth. It’s 20 times larger, in the habitat zone of its star, and has a sustainable atmosphere. This story pans throughout multiple generations, with the main cast varying along with it.