I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: The Hunt for Red October Movie plot: In November 1984, Soviet submarine captain Marko Ramius (Sean Connery) commands Red October, a new Typhoon-class nuclear missile submarine with a stealth "caterpillar drive", rendering it undetectable to passive sonar. Ramius leaves port to conduct exercises with attack submarine V. K. Konovalov, commanded by his former student Captain Tupolev (Skarsgard). Once at sea, Ramius secretly kills political officer Ivan Putin (Peter Firth) and relays false orders that they are to conduct missile drills off America's east coast. The next morning, CIA analyst and ex-Marine, Jack Ryan (Alec Baldwin), after consulting with Vice Admiral James Greer (James Earl Jones), briefs United States government officials on Red October and the threat it poses. Officials in the briefing learn that the bulk of the Soviet Navy has been deployed to sink Red October and they fear Ramius plans an unauthorized nuclear strike against the United States. Ryan, however, hypothesizes that Ramius instead plans to defect, and leaves to rendezvous with the American attack submarine USS Dallas to prove his theory. Meanwhile, Tupolev, though unable to track Red October, guesses his former mentor's route and sets a course to intercept. Typhoon-class submarine, the same type as the fictional Red October. Due to the actions of an unknown saboteur, Red October's caterpillar drive fails during risky maneuvers through a narrow undersea canyon. Petty Officer Jones (Courtney B. Vance), a sonar technician aboard Dallas, has discovered a way to detect Red October using underwater acoustics, and plots an intercept course. Ryan arranges a hazardous mid-ocean rendezvous to board Dallas, where he attempts to persuade its captain, Commander Bart Mancuso (Scott Glenn), to contact Ramius and determine his intentions. The Soviet Ambassador informs the U.S. that Ramius is a renegade, and asks for help in sinking Red October. That order is sent to the U.S. Fleet, including Dallas, which has found the Soviet submarine. Ryan, however, is convinced that Ramius plans... My question: What is Red October?
A:
a submarine