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What's the movie about escaping from a city where the punishment was suffocation under a large dome?

I remember it was about a couple trying to escape from their city, while they were chasing them (I don't remember the exact reason, I think it was maybe because they had a kid and giving birth to children was forbidden, but not sure about that aspect of the story).

Spoiler alert: If I recall the movie's ending correctly, at the end they capture them under a large dome, made to cover the infringers until they suffocate, but they managed to dig the asphalt beneath them and escape under, through the sewer system.

I saw this movie once, about 20 years ago, probably rented at the local VHS rental, please help! Thanks in advance!
asked Feb 7, 2013 in Name That Movie by Saxtus (11 points)

1 Answer

 
Best answer
Z.P.G.
IMDb: http://www.imdb.com/title/tt0069530/
Trailer: http://youtu.be/RLVrtfQ6Udk

Thanks to The_Optimistically_Pessimistic1 from IMDb boards:
http://www.imdb.com/board/bd0000001/thread/210470449
answered Feb 7, 2013 by Saxtus (11 points)
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