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18 years old Peter has his first love Jana, that gets pregnant. To obtain a flat, despite his parents resistance, he starts to work in mine, where his father Milan works too. Elite miner, that is suffering from claustrophobia, after he survived a caving. Through Peter's eyes we are getting to know tough friendship, as well as inconceivably hard work 600 meters under surface.

July, 7th, 1961. Dukla mine, due to lack of safety precautions, turn to blazing hell. Fear, chaos, panic, but also the bravery and determination to save those, who stayed under the surface.