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In occupied Silesia, resistance is organizing. In close contact with the miners and led by an engineer, a group of partisans prepare the sabotage of the steel combine. The going will be tough as the place is closely guarded by the Nazis. But despite a denunciation from a traitor and several violent deaths, they get going and the operation is a success. But the Red Army is approaching and now the coal production must not be sabotaged anymore.