Odessa, besieged by the Nazi invaders, was left without water: the Germans occupied the nearby village, where the water station is located. It is necessary at all costs to save the inhabitants, at least for several hours to give the city water. The attempt to land troops in the village was unsuccessful. To contact the workers of the water station, scout Masha leaves behind enemy lines. Not having any news from her, the command sends the sailor Bezborodko, who knows German, supplying him with documents of a captured Hitler officer. Following him, the entire detachment crosses the front line. And then a signal was given to the offensive. The German guard was silently removed, cars started up ... And while the sailor heroes are engaged in an unequal battle with the Nazis at the water station, the water goes to the besieged city.