too scary for me, i liked it

as others say there are plot holes in this film, but for me it was too scary, as its realistic this could happen, an open wound in sea water,untreated would get gangrenous, it would be very painful.
i think the film may have been editted heavily to make it shorter ,and this lost credibility,so would explain how she knew the buoy had a spiky anchor.
but she was gorgeous, and acting wasnt bad and photography was great, but the open wounds and gruesome attack on the drunk man, had we watching through my fingers