...humans living underground because something had happened to the surface of the Earth. People were told that living on the surface was impossible, but one man thought this was untrue and fights his way to a hatch to the surface. He emerges on the surface at the end of the book and finds empty land that appears to be habitable. Of course, this leads to another book to pick up the story.
I read this book as a teenager (um, a long time ago
) and can't remember for the life of me any more details, the title, or author. Does this vaguely-described plot I provided sound familiar to anyone?