The Fourth Day, Monday, 6 December Summary

Jack Ryan reports to the CIA, meeting with Vice Admiral Greer. He has surveillance photographs of the Red October taken by British intelligence. He wants to trade these pictures for information about the American nuclear program. One issue with the photographs is that there is one showing a set of doors that they do not understand the purpose of. Ryan takes the pictures to his friend, Skip Tyler, who realizes that they are part of a silent propulsion system. Ryan insists on giving Tyler access to government computers in order to figure out more about the theoretical capabilities of this silent propulsion system.

The sonar surveillance system tracks all naval operations. They detect the USS Dallas, which is supposed to be silent. They also track the Konovalov, which has surfaced because it has not met the Red October for...