In November 1984, the Soviet Union was on the eve of Gorbachev's coming to power, and it was also the climax of the Cold War between the United States and the Soviet Union.
The Soviet Union developed a new type of nuclear submarine "Red October" and sent an experienced Remis to take charge of the boat's first trial exercise. At this time, the US Central Intelligence Agency also obtained information about the "Red October".
During the exercise, the captain Remis killed the arbitrary political commissar who discovered his privacy and ordered the submarine to change its course. He claimed to all officers and soldiers that the move was to use the advanced silent propulsion system of the boat to pass through the surveillance network of the US Navy and to indulge in visiting the US coastline. The US submarine "Dallas" was unable to track the "Red October", which made the United States very scared and thought it was a sneak attack. At the secret meeting, Dr. Li, a CIA intelligence officer, boldly believed that Remis led the ship to change its course as a deliberate renegade and defected to the United States. Therefore, the CIA gave Lebanon three days to try to get in touch with Remis here, otherwise the "Red October" would be annihilated.
On the "Red October" nuclear submarine, Remis convened a military and military meeting to indicate his intention to change. At this time, the Soviet side also believed that the "Red October" had surrendered to the United States and sent a large number of ships to search for the "Red October", and the ships of the US military also detected the ship from time to time. Ning Weiyu's Su fired a torpedo in the direction of "Red October", and at this moment, there was damage by hidden spies in "Red October".
"Red October" took the risk and came to the US submarine "Dallas". After learning that the purpose of Mark Remis's trip was to launch missiles to the United States, it insisted that it was the Soviet side's desire to borrow the US military. To destroy the "Red October" conspiracy. After a brief contact with the signal lights, the "Red October" suddenly fled south. Soon, "Red October", which surfaced due to a malfunction in the ventilation system, was overtaken by the US destroyer. The US military launched and self-detonated the torpedo and falsely claimed that it sank the "Red October" in an attempt to deceive the Soviet side. Afterwards, the US submarine sent small boats carrying Li and others into the "Red October" to negotiate with Remis, and Remis asked for asylum from the United States.
The Soviet side once again launched torpedoes at the "Red October", Remis ordered the submarine to drive towards the torpedo, making the torpedo difficult to detonate due to the close distance. At this time, the spy was destroying again. Before another torpedo came, Li finally found and killed the lurking spy. The veteran Mark Remis lured the Soviet torpedo into a detour and sank his submarine. In the end, the "Red October" sailed into the harbor of the United States.