The Hunt for Red October (film) 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. Once at sea, Ramius secretly kills political officer Ivan Putin and relays false orders that they are to conduct missile drills off America's east coast. At the same time, American attack submarine "USS Dallas", tasked with identifying and shadowing Soviet subs as they leave port, detects "Red October" as it begins its mission, but immediately loses track of it once the caterpillar drive is engaged. The next
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