Hisashi Ouchi was a technician at the Tokaimura nuclear plant in Japan. On September 30, 1999, he was exposed to a massive dose of radiation—17 sieverts—during a criticality accident, far exceeding the lethal dose. His exposure was one of the highest ever recorded in a human. Ouchi suffered catastrophic radiation burns and his internal organs began to fail. Despite his critical condition, doctors made extensive efforts to keep him alive, leading to him enduring 83 days of extreme pain and suffer