Tension filled tale of a US Naval captain’s maniacal pursuit of a trespassing Soviet submarine that turns into a fatal obsession. Richard Widmark gives a strong performance as the captain who follows a logic based on sense of duty, patriotism and antagonism that ultimately pushes his adversary to desperate retaliation. The results of this quest are not good. As bleak an ending to this one as may be found in the genre of war films and speculative cinema. Some people just don’t know when to give up. In B & W.