Red October (fictional submarine) the "Red October" adventure proved useful to Ryan's career. In later books, Ryan is able to use his heroism in obtaining the submarine as a lever with which to force a threatening KGB Secretary to defect to the U.S. against his will (in the novel "The Cardinal of the Kremlin"), ending the possibility of a Kremlin coup against a politically centrist Soviet government. Years later the truth of these events comes to light when political opponents of then-President Jack Ryan reveals his part in the affair. By this time in the early 1990s, the Soviet Union has collapsed and the
The Hunt for Red October are many deviations, including "Red October" traveling up the Penobscot River in Maine to dry dock, and the "caterpillar drive" being described as a magnetohydrodynamic drive system, essentially, "a jet engine for the water". The film received mainly positive reviews from critics, holding an 87% rating from Rotten Tomatoes based on 66 reviews. It was the 6th top-grossing film of the year, generating $122 million in North America and more than $200 million worldwide in box office. In a 1991 interview, Clancy remarked of the film's success: "It was reasonably true to the spirit of the book, although the movie