Take Two have launched a mysterious teaser site called There's something in the Sea where tales of a strange red light being spotted in the sea and disappearances of young girls at the hands of a tall, thin "monster" with a red eye.
According to Kotaku these clues lead to a new member of the Bioshock universe - the Big Sister. Nothing confirmed at this point, but as always when it comes to Bioshock 2 we are intrigued.