When the sun burns the surface to temperatures that people can no longer survive on the surface, humans have turned below.  Now, survival means making the underground their home.  And that means everyday is survival and life that much more difficult. But the human race have found ways to survive.

When the sun burns the surface to temperatures that people can no longer survive on the surface, humans have turned below.  Now, survival means making the underground their home.  And that means everyday is survival and life that much more difficult. But the human race have found ways to survive.