The Seventh Day, Thursday, 9 December Summary

Ryan and another high-ranking officer, Davenport, go to the USS Kennedy to inform the commander, Painter, about the Red October. They get help from the British HMS Invincible. On the Dallas, Jones and Mancuso figure out that the strange sound they have been listening to is a Russian submarine. They transmit this information by satellite. Headquarters gives Dallas permission to pursue the mystery submarine. The Konovalov has received its orders to hunt down the Red October and the captain intends to sink it.

Ryan arrives on the HMS Invincible and passes along the information to the senior officers. On the Red October, the doctor runs a standard test for radiation on the radiation badges on the crew. Many of the badges show strong radiation exposure. The crew checks for a radiation leak but cannot find anything. What the doctor...