The Hunt for Red October (film) to develop it into a film. Screenwriters Larry Ferguson and Donald Stewart worked on the screenplay while Neufeld approached the U.S. Navy for approval. They feared top secret information or technology might be revealed. However, several admirals liked Clancy's book and reasoned that the film could do for submariners what "Top Gun" did for the Navy's jet fighter pilots. Captain Michael Sherman, director of the Navy's western regional information office in Los Angeles, suggested changes to the script that would present the Navy in a positive light. The Navy gave the filmmakers access to several s, allowing them to photograph
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