I just finished watching this film 5 minutes ago, and I feel compelled to comment on this fantastic movie due to the impact it had upon me. Needless to say, if this film was available on DVD, I would be the first to buy it. The movie follows a sabotaged US submarine carrying a British (Patrick McGoohan) and Russian agent. One of these passengers, the viewer is forced into suspecting, is the saboteur and traitor trying to obtain the boby-trapped capsule containing a microfilm that all of the major superpowers desire. The movie maintains the viewers interest throughout, while perhaps not keeping the viewer on the edge of his/her seat. Moreover this film keeps the audience firmly interested in the transfixing storyline, concluding in a Sixth Senthesque twist finale exposing the Russian spy. While the bulk of the film is not action packed, the ongoing mystery is rivetting, and the final scene is as tense as any thriller/chiller available today exsacerbated by the Russian-American military stand-off on the ice plains near the north pole. Worth buying simply to see the ever cold and covert character portrayed by McGoohan in this and other shows, especially the unbreakable Number 6 in "The Prisoner"