During the height of the Cold War, a Soviet nuclear-powered submarine embarks on a crucial mission, but the tensions on board are palpable. The crew, composed of brave sailors, faces a series of challenges that will test their bravery and camaraderie. Captain Alexei Vostrikov is a strict leader, determined to lead his team on the mission despite adverse conditions and a lack of experience. However, everything complicates when a failure in the cooling system causes a radiation leak, threatening the lives of everyone on board and the security of their country.
As time runs out, the men must decide between fulfilling their duty and preserving their own lives. With pressure mounting and distrust growing within the submarine, the situation becomes increasingly critical. Vostrikov and his second-in-command, Mikhail Polenin, must find a way to stabilize the at-risk reactor, facing personal fears and the pressure from the Soviet government.
The sacrifices they will make in their struggle against the nuclear disaster will not only test their courage but also the bonds that tie them together as brothers in arms. In a story that combines technical tension with a deep sense of duty and loyalty, the men aboard this submarine will learn what it truly means to be heroes in the worst imaginable circumstances.