Az öreg bánya titka (1973)

The story takes place in a small mining village close to the border. One night, after a huge storm the ground opens up and the entrance of an old mine appears in it. On the coming day village children discover it and want to go down immediately, but an old miner give them short shrift, saying that it is dangerous. The children are suspicious of the old man's reaction, so they begin to observe him. It soon becomes clear that their suspicions were not unfounded.