All I remember is a few scenes like 2 kids explored a town that was once underwater and found a man chained up with a bag on his head they freed him and the first thing he did was pull back one of the kids faces and drank the blood off his scalp. Then it was like 10 years later and the town was underwater again I think but that's all I really remember.

Beneath Still Waters (2005) (http://www.imdb.com/title/tt0371572/reference)