There was a comic that told the story of an underground society. A nuclear war was still going on. Radiation was seeping down into their caverns. A scientist was tasked to find a safer location deeper down. However, he found the mutated remnants of an earlier human society that experienced a previous nuclear war. Trying to recall the name of the comic or the story itself. I am thinking mid 80's when I read this but could be an earlier time when it was written.