Watch VoirFilms. Although it was in full operation for less than one-year, Belzec was a very efficiently run Concentration Camp were over 600,000 Jews were slaughtered. As the Russian army was drawing closer and closer to the camp, the Nazi dismantled Belzec and eradicated virtually all the evidence that the camp ever existed. This documentary tells the story of Belzec and reminds the world "never forget".