Kameradschaft

The first scene underground, director G.W. Pabst in what looks very like a coal mine but really was a built set, starts with the workers on the German side then crosses the wall to the French, where there's a persistent fire, in Kameradschaft (a.k.a. Comradeship), 1931.

French Francoise (Andree Ducret) is leaving on the train from the coal town on the German border, having decided she can't marry her miner boyfriend, when director G.W. Pabst goes underground for a remarkable early-sound action scene, in Kameradschaft (a.k.a. Comradeship), 1931.

After an explosion on the French side of a coal mine along the border, director G.W. Pabst's first scene on the German side, in an enormous industrial locker room, Ernst Busch as "Wittkopp" advocating for joining the rescue effort, in Kameradschaft (a.k.a. Comradeship), 1931.