Ok, so, fine...I have a thing for submarine movies. I can't help it. It's what I do...so take this with a grain of salt.
I really dig this movie. You know what makes it interesting (aside from the great story, action and acting) is the fact that it's hard to know who the bad guy is.
I mean...I know what the writer / director wants me to think...but in reality, there's no black and white here...just lots of gray.
Totally worth watching.