The Hunt for Red October Reykjanes Ridge off Iceland. "Dallas" hears the sound of the stealth drive but does not identify it as a submarine. As tensions rise between the U.S. and Soviet fleets, the crew of "Dallas" analyzes sonar tapes of "Red October" and finally realizes that it is the sound of a new propulsion system. Meanwhile, CIA analyst and former Marine Jack Ryan, who was initially tasked to examine MI6's photographs of "Red October", finds out that the submarine's new construction variations house its stealth drive. Later putting information about Ramius's letter together with the subsequent launch of the entire Northern Fleet, Ryan
The Hunt for Red October (film) "Red October", guesses his former mentor's route and sets a course to intercept. The Soviet fleet's intentions are unknown to the U.S., although their orders are to sink "Red October". Due to the actions of an unknown saboteur, "Red October"s caterpillar drive fails during risky maneuvers through a narrow undersea canyon. Petty Officer Jones, a sonar technician aboard "Dallas", has discovered a way to detect "Red October" using underwater acoustics, and plots an intercept course. Ryan arranges a hazardous mid-ocean rendezvous to board "Dallas", where he attempts to persuade its captain, Commander Bart Mancuso, to contact Ramius and determine his