Lost Title of Similiar Animated Cartoon (Any input appreciated)
I remember when i was a kid, maybe around 10 years back, I watched an animated movie on TV with a similar storyline. I can't recall the title though, but it was VERY good. I am trying to recall the name so I can watch it again.
Basically its a story about the future, about a world that is uninhabitable due to wars and pollution. The last remnants of humanity live in an underground cavern. The people there have lived a long time, and have a long foretold prophecy that when the lava river rises (the river which provides heat to the people there), it would be time to approach the surface once more.
The lava river does rise, but most of the people are reluctant to move, dismissing the stories as myth. They eventually perish.
The few who do leave though undergo a perilous journey to the surface, always just ahead of the lava river that follows them... and well..after severe casualties.. reach the surface...
Does this storyline remind anyone of a movie title?