We have all seen sonar waterfall displays, what most do not realize is that those came before the large CRT screens needed to display the data. The "screen" was actually a printer continuously printing the output from a microphone array.
Waterfall printer display is at the 18:52 point. (Footage of these is very rare.) https://youtu.be/fJafj2o3Wo4
How did this prevent nuclear war? Why would the soviets otherwise have launched a first strike?
And to my knowledge, the october missile crisis has nothing to do with that movie, except submarines are the topic.