Both men are competent naval officers, and Polenin does his best to work with Vostrikov; his men consider Polenin their captain but are persuaded to go along with the senior man, even after Vostrikov orders a dive that tests the ultimate limits of the sub's capabilities. (Such scenes, with rivets popping and the hull creaking, are obligatory in submarine movies.) Most of the big scenes take place in close quarters on the command desk, where dramatic lighting illuminates the faces and eyes of men who are waiting for the sub's shell to crack. By casting the two leading roles with authoritative actors, "K-19" adds another level of tension; if one were dominant and the other uncertain, there would be a clear dramatic path ahead, but since both Vostrikov and Polenin are inflexible, self-confident and determined, their rivalry approaches a standoff.

The sub's mission is to demonstrate the Soviet Union's new nuclear submarine power to the spy planes of the Kennedy administration. The sub's voyage is shadowed by a U.S. destroyer, which is not unwelcome, since the purpose of this mission is to be seen. When there is an accident involving one of the onboard nuclear reactors, however, the game changes: If the reactor explodes and destroys the U.S. ship, will that event be read, in the resulting confusion, as an act of war? K-19 could surface and put its men in lifeboats, but for Vostrikov the thought of the United States capturing the new technology is unthinkable. Therefore, the options are to repair the reactor, or dive the boat to its destruction.

More problems. The K-19's original reactor officer, an experienced man, has been fired for alcoholism and replaced with a recent naval academy graduate. This man, Vadim (Peter Sarsgaard), is not only inexperienced but scared to death, and he freezes when the accident occurs. As the reactor core overheats, the crew comes up with a jury-rigged quick fix--diverting the onboard water supply--but that involves men entering the sealed reactor compartment to weld pipes and make repairs. They should wear protective radiation suits, but alas, the captains are told, "The warehouse was out. They sent us chemical suits instead." Neeson: "We might as well wear raincoats." The scenes involving the repair of the reactor are excruciating, and director Kathryn Bigelow creates a taut counterpoint between the men who take 10-minute shifts in the high-radiation zone, and the growing tension between the two captains. Footage involving radiation sickness is harrowing. A mutiny is not unthinkable. And meanwhile, in Moscow, K-19's sudden radio silence inspires dark suspicions that the sub has been captured, or given away by traitors.

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