(SPOILER) Physical question about rescue
Maybe I just wasn't watching closely. I just didn't see what it was the people trapped in the bottom of the mine shaft discovered that enabled them to effect their own rescue They said, in effect, AHA! And sudenly they were being pulled out. They mentioned the old mine car, but how did that help them?
Also if the newscaster who jumped into the mine had been wearing a wireless microphone, that might have provided some possibility for one-way communication FROM the bottom of the shaft. But the film did not exploit that possibility.