Thale (2012)

A Norwegian legend comes to terrifying, yet oddly arousing, life in Thale (2012). While out on assignment for their crime-scene cleanup job, Leo (Jon Sigve Skard) and Elvis (Erlend Nervold) discover a mysterious, mute young woman hiding in a basement. They give her the name Thale and take her with them back to civilization, but this wild thing turns out to be far from harmless. Silje Reinåmo stars as the mythical creature, and while she is undressed throughout most of the movie your best glimpses come at the 17-minute mark, where she emerges from the tub, and 1 hour and 1 minute in, where she does the same thing, but with far deadlier consequences.