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Dystopian movie with children in a parallel universe - forced to work underground

Some kind of dystopian movie with children who were abducted and pulled underground and forced to work at a device of some kind..I also remember there was a huge machine with blinding headlights that was patrolling the streets during night time so the kids wouldn't escape. Might also involve an alien entity in the form of a small ship who wanted to contact home. I also remember something from the ending..a glowing sign on a stone door and a small stone chamber that got flooded somehow.
asked Jul 31, 2016 in Name That Movie by Drakkar1990 (1 point)
Unfortunately, it's not City of Ember.. :(
What about "The City of Lost Children"?