You can expect to be in a bad mood -- in a good way -- after seeing The Tunnel, Roland Suso Richter's disturbing film about the Berlin Wall.

The Tunnel, which is set in 1961, concerns the true story of East German swimming champion Harry Melchior. When the wall that divided Berlin was built, Melchior (Heino Ferch) was able to escape from the Communist side; his sister, however, was not able to leave with him, and Melchior promised her he would return to get her and her family.
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