After the outbreak of nuclear war, human survivors can only hide in nuclear bomb shelters that only provide basic living materials, so hundreds of years later,

The influence of nuclear weapons should not last for hundreds of years, just ten years.

After the nuclear explosions in Hiroshima and Nagasaki, urban reconstruction was completed within five years. Although there is nuclear radiation pollution, it is still acceptable compared with underground life. Ukraine did give up Chernobyl city after the Chernobyl nuclear accident, and high doses of radiation can still be detected so far, but this is because the block itself is an inaccessible area, so it gave up and gave up. If people are really alive, it's just that there are more people suffering from diseases such as cancer, and the rate of neonatal malformation is rising. Still much better than living underground.

Nuclear bomb bunkers can only be used for temporary refuge, not for long-term residence, and there can be no virgin forests, forest farms, pastures and farms in caves. Only a few species, such as mushrooms, fungi, ganoderma lucidum, algae and fungi, can survive without sunlight.