Petr returns home and brings his pregnant girlfriend with him, he decides to take care for her and their child.

Marie and Jana are afraid that he won't survive working in the mine.

Petr eventually starts to like his job in the mine and befriends other miners - Eda Slonka, Attila Kovács, Josef Polok, Kafura, Cyril and Vladimír Pawlas.

Meanwhile Milan finds out that his superiors, Kotas and Toman, violated safety regulations in the new seam and had installed wooden doors instead of concrete one.

Petr says it won't happen again but refuses to return to studies as he likes the job in the mine.

Meanwhile a fire erupts in the mine and smoke is quickly spreading through the wooden door at the new seam.

Milan quickly realises that miners are unaware of the danger and so he smuggles himself into the mine despite his anxiety attack.

While he goes through tunnels, he suffers another anxiety attack but eventually finds miners including Petr.

He warns them and decides to lead them to safety but the way is cut but large section filled with smoke.

Rescuers are forced to seal off sections affected by the fire to prevent an explosion.

Kotas and Toman are forced make a list of miners who died in the accident.

Kafura, Polok, Cyril and Pawlas die in the accident as well while Kovács and Slonka survive.

Marie and Jana then live together in the apartment and take care of the rest of the children.