Indeed this wasn't the classic American good guys vs Russian bad guys. This movie is a nice action thriller, in which good and bad guys aren't defined by a flag. Good acting, good direction, and overall, good knowledge of the military systems that were or could have been involved in the movie's scenario. Certainly is not my favorite submarine movie, but you will love this one, the best in the modern era. Is really satisfying. The only bad thing is that the movie is self-contained and there won't be a part II.