When British intelligence discovers the Nazis are producing "heavy water," an essential element in the production of atomic weapons, at a top-secret facility in Nazi-occupied Norway in 1942, an underground freedom fighter (Richard Harris) and a scientist (Kirk Douglas) put aside their differences to try to destroy the facility. Based on actual events, this 1965 thriller is filled with innovative stunts and stunning location shots. Widescreen, 2 hrs. 10 min.