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 novel as "the most satisfactory novel of a sea chase since C.S. Forester perfected the form". Due to an extensive marketing campaign by the Naval Institute Press for their first published work of fiction, which was initially aimed on the military, the book sold 45,000 copies by March 1985. Clancy said in a 1991 interview: “I thought we’d sell maybe five thousand or ten thousand hardcovers and that would be the end of it. I never really thought about making money.” After Reagan's endorsement, "The Hunt for Red October" topped the national bestseller lists, particularly "The New York Times". It