The Hunt for Red October (film) essentially revealed the use of gravimetry as a method of silent navigation in US submarines. Thought to be a billion dollar black project, the development of a full-tensor gravity gradiometer by Bell Aerospace was a classified technology at the time. It was thought to be deployed on only a few s after it was first developed in 1973. Bell Aerospace later sold the technology to Bell Geospace for oil exploration purposes. The last Typhoon-class submarine was officially laid down in 1986, under the name "TK-210", but according to sources was never finished and scrapped in 1990. The musical score of
The Hunt for Red October eventually sold more than 365,000 copies in hardback. After securing the paperback rights to Berkley Books for $49,500, the novel sold another 4.3 million copies. The novel was adapted as a feature film, which was released in the United States on March 2, 1990, months after the Cold War ended. Captain Marko Ramius was played by Sean Connery, while Alec Baldwin played Jack Ryan. It serves as the first entry in the Jack Ryan film series, which would later follow a chronological order differing from the novels. The movie is a nearly faithful depiction of the novel even though there