If you're only interested in horrors that are fast faced, gruesome, and action packed from the start, perhaps this isn't the film for you. If you like tension, implied horror, and have an imagination to fill in the gaps, this is very probably a time that you will enjoy.
The accompanying music is very much in keeping with the film, it adds to the atmosphere, and never intrudes. It's very nicely filmed, with some great shots of the sea, they make it look even more bleak and vast than we know it to be. The shots of the dead animals add a real sense of curiosity. The acting is excellent.
If you suffer anything associated with flashing lights, be aware that there are a few scenes in the middle part.
It's definitely a slow burner, but stick with it, it is definitely worth watching.