The group chose four survivors for a post-apocalyptic bunker: a botanist scientist to develop crops, an army officer with PTSD for security, a doctor to provide medical care, and an engineering professor to help rebuild civilization. The botanist will use her plant knowledge for greenhouse farming and future rebuilding. The officer will protect the group after leaving the bunker, and his military skills can provide food. The doctor can treat illness and assist with childbirth, passing on his medical knowledge. The professor's engineering expertise is crucial for reconstructing civilization.