Quite a good movie they have here. It seems so bizarre that they would bury it like they did. It has capable actors who do a lot with the film, excellent set design, great tension, excellent atmosphere, some nice technical detail with regards to submarine, as well as a nice resolution (if a bit...
I think we had a "Pitch Black II : Chronicles of Riddick" thread in Movies a while ago. Search is overloaded right now, but it should be findable in that forum.