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 (film) to rewrite the whole film but was only required to do the Russian sequences. Rather than choosing between the realism of Russian dialog with subtitles, or the audience-friendly use of English (with or without Russian accents), the filmmakers compromised with a deliberate conceit. The film begins with the actors speaking Russian with English subtitles. But in an early scene, actor Peter Firth casually switches in mid-sentence to speaking in English on the word "Armageddon", which is the same spoken word in both languages. After that point, all the Soviets' dialogue is communicated in English. Connery continued using the Russian accent