A devastating atomic war wiped out almost the entire population of the Earth. The civilization as we know it has been destroyed. The Earth has become a huge radioactive area. Only the most courageous ones dare to dwell on the surface, forming communities and building new cities. Many people live in Vaults, huge underground dwellings. You play the role of an inhabitant of Vault 13. Recently, the water purification controller chip was broken. Without clean water, the people of the Vault cannot survive. You are sent to retrieve a chip from another Vault. And you venture outside, to face a dangerous world and to find your place in it.