Kameradschaft, or Comradeship, a 1931 film directed by Georg Wilhelm Pabst
In 1932, Coppi was expelled from the Schulfarm after supporting some students who had watched Georg Wilhelm Pabst's banned Franco-German solidarity film Kameradschaft.
Pabst took an actual historical event, a mining accident in 1906 in Courrières, France, where rescue efforts were hampered by the lack of trained mine rescuers.
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After the end of World War I, due to the Treaty of Versailles, an old German mine is split in two because of the new border, and the mine is closed off at the border, including an underground mine.