This film is adapted from Tom Clancy's best-selling novel. 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 when the two superpowers, the United States and the Soviet Union, were fighting openly and secretly. The Soviet Union developed a new nuclear submarine "Red October" and sent the experienced Remis to be responsible for the first trial exercise of the submarine. At this time, the US Central Intelligence Agency also obtained intelligence about the "Red October". On the way, Captain Remis killed the tyrannical political commissar who discovered his privacy and ordered the submarine to change course. He claimed to all officers and soldiers that this move was to use the submarine's advanced silent propulsion system to pass through the US Navy's surveillance network and indulge in a tour of the US coastline. A senior Soviet general secretly hijacked a super military submarine "Red October". Did he want to defect to the United States or create a nuclear war? The Soviet Ministry of Defense was greatly shocked and sent troops to pursue him. The US Central Intelligence Agency also sent elite troops to intercept him. A pursuit operation that linked the military balance between the United States and the Soviet Union began.