Within their group, the students had to decide which four of 13 people to save during a global flu outbreak. They chose to save a scientist who could develop a cure or help rebuild society, a drug-addicted hippie who might have useful medication, a mentally unstable army officer who could enforce rules, and a doctor in case of medical emergencies while repopulating the earth. The group felt these four had skills most useful for survival in the bunker and rebuilding the world.