Under the Sand is a French film that gave me the chills. A long married couple goes on holiday to the beach. As the wife lays in the sun and naps, her husband goes swimming. When she wakes up, he's nowhere to be found.
The main part of the movie is watching her cope (or really not cope so much) with her husband's supposed death. My favorite part was the scene with her mother-in-law.
The film is well made but I always felt a bit too aloof from it all. So in my book, it gets a 4 out of 10.
I give this one a