Realism
The true element which gives a science fiction or action drama film its character is the realism of the plot as well as the props.
Being a United States Navy Sailor, I was unable to focus on the plot of the film, as I was far too distracted by the immense mistakes made with the naval uniforms (I mean come on, I have to wear that uniform DAILY!). From the opening scenes, I saw that the captain was totally out of uniform, wearing Lieutenant Commander shoulder boards but a commander's collar device. His ribbons were so far out of order, that after I caught my breath from laughing, I literally threw the DVD player's remote across the room. LT Trifoli's uniform while on the submarine said she was Surface Warfare Officer qualified. However, when in her dress white uniform, she only bore three ribbons. Was she really qualified, or was she trying to be more than what she was? She'd catch hell for that in the REAL Navy!
When I felt I could resume watching the film again, I had to force myself not to pay any attention to the uniforms so that I could focus on the plot. With that said, giving a lieutenant commander any kind of authority over a commander is just outright absurd. If anything, the admiral should have at least frocked LCDR Barker to commander and made him an equal rank to the skipper. That would have showed the audience that the film writers did their research.
Finally, the graphics. Well, they were obviously computer generated and seemed eerily similar to those found in the video game "Silent Steel." They, too, posed another distraction to me which prevented me from focusing on the plot.
As a word of advice to those producers and directors who attempt to make a naval film, please, please, PLEASE do your research to ensure the little errors--like that captain wearing a Petty Officer First Class collar device-- don't take away the realism from your work. If I had not been in a better mood as I watched this film, I would've been thoroughly offended, as this uniform is what I and 352,000 others wear day in and day out in defense of our nation. Good day, all.