He continues to search for any signs of humanity despite the mounting odds against him. Today, only a handful of people remain, struggling to survive in government-created fallout shelters, waiting for the radioactive poisons to dissipate. But as radioactive poisons began to pollute the air, many fell prey to the toxic fumes, despite the efforts to churn out enough anti-radioactivity medicine to combat the lethal clouds. Many people managed to initially survive the fallout. It's been 10 years since a devastating nuclear war destroyed most of Earth.