For all the lackluster films that have come and gone with little fanfare, there is occasionally a diamond in the rough. Even if it didn’t gain much notoriety during its run in theaters, there was one movie that swam its way into a suspenseful and surprisingly enjoyable foothold in the horror genre: Underwater, starring Kristen Stewart and the big bad Cthulhu himself. The film breathes a welcoming originality into the mysterious enemies that slowly pick off the cast one by one…