A fast-paced and overall enjoyable movie, though at times a bit difficult to follow. One little bit of dialogue changes the entire direction of the plot. And the dark submarine lighting, coupled with the theatrical trick of making the Russians speak in English (for the audience's benefit), makes it difficult to determine the ship where the current action is taking place (to the audience's detriment). You may have to pause the movie and talk through what's happening with other people. It's good enough that a second viewing to better navigate each plot twist would still be enjoyable.