-dystopian future tent city with fireflies in jars for light. The sky is purple.

-some kids run away to try and find a rumored remnant of the old earth where the air/sky is still clean and blue.

-the kids try to find the place with a tall, deformed character similar to the Goonies.

-a tunnel collapses and I think the deformed character dies in it to save the children who exit the tunnel onto a clean, beach with a blue sky