S5, E4: Franz Marthaler is worried about a golden eagle clutch and is keeping watch at night over the slope where the nest is located, when he suddenly discovers a climber on the steep mountain face. With Toni Stössl's help, he manages to apprehend the suspect, when suddenly the slope begins to slide. While Franz remains unconscious in the falling rubble, Toni and Tom are buried in an old mine tunnel. The next morning, the disappearance of the three is noticed and a feverish search begins. Since the mountain rescuers initially have no clue as to where the missing men might be, they are unaware that their race against time has already begun.