On the day the world ended, the fate of mankind was carried in a small metal box. In a secret location, architects, scientists and engineers met.....

City of Ember -- the movie -- the prologue -- released in 2008, based on book from 2003 by Jeanne DuPrau

"On the day the world ended, the fate of mankind was carried in a small metal box. In a secret location, architects, scientists and engineers met and concluded that there was only one hope for the future: to build an underground city designed to keep its citizens protected for generations to come. [Very similar to a polar city settlemnt in the northern regions of the world, circa, 2500 AD, according to James Lovelock]

Secure the box; set it for 200 years. We'll keep them in the city for 200 years. Growing up with no knowledge of a world outside, future generations will be spared sorrow for what we've lost."

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City of Ember -- the movie -- the prologue -- released in 2008, based on book from 2003 by Jeanne DuPrau