A group of recent high schools graduates from Louisville, Kentucky decide to go on a spelunking trip together. While in the cave, their exploration is disrupted by a large blast. They resurface only to find that their city has been destroyed.

A group of recent high schools graduates from Louisville, Kentucky decide to go on a spelunking trip together. While in the cave, their exploration is disrupted by a large blast. They resurface only to find that their city has been destroyed.