The group chose to keep the scientist, doctor, army officer, and 5-year-old girl in the bunker. The scientist and doctor could help find a cure for diseases and teach their children. The army officer would provide security and teach order. The young girl could help in the future and have children with the scientist and doctor's children to repopulate the world. They did not select others like the priest, drug-addicted couple, pregnant woman, elderly or disabled as they could not adequately contribute or survive in the bunker.