I just re-watched Submerged, and although the voice dubbing is very annoying, I have a soft spot for this movie. All those different locations look great and visually the movie looks good (not the special effects, but I can see through that). The action is shot well, and I like the last action scene when Seagal drives his car into the helicopter, crashes it in the main hall of that building, shoots every bad guy with a shotgun and then fights the bodyguard at the elevator. I also like all the different colors or filters that are used.
The movie is all over the place (military, submarine scene, opera scene, sci-fi,), but I think that's what I like about it. If the terrible voice dubbing wasn't there I think this could have been one of my favorite dtv Seagal movies.