The group must decide which 4 of the 13 remaining people on Earth should stay in the bunker to survive and reproduce, as only 4 can be accommodated and resources will only last 6 months for all 13. They choose the scientist for her disease research skills, the priest for his role in potential future society and religion, the doctor for medical skills, and the university professor for his botanical knowledge important to long-term survival. The others were left to die outside the bunker due to being drug addicts, too many dependents to support, mental instability, old age, disability preventing self-sufficiency, lack of obvious use, or perceived laziness.