A group of young scientists conducts an experiment, putting themselves in the conditions of the people of the Stone Age. With the help of stone tools, they procure food and fire, and make themselves comfortable in nature.
During World War II, an old man, David, living with his daughter-in-law, Maria, while his son is away at war, is being regularly harassed by a German airplane, until one day, when he decides he's had enough.
In the port of Danzig, the military transport Tyrol is preparing to leave, on board which are selected SS units and seventy naval crews. The commander of the Soviet submarine "S-31", which received serious damage, receives the task of detecting and attacking enemy transport...
