Based around real life events that happened in 1983, The Reef is Australian director Andrew Traucki's follow up to his crocodile horror Black Water.
Truth here is that if you have seen the likes of Open Water, Adrift, Black Water and the under valued Frozen, then this really doesn't hold any surprises, it is what it is, a bunch of friends ending up in a battle for survival as one of mother nature's predators stalks and homes in for the kill. However, this is done with some style, it looks very nice, is well performed (even though the characters are thinly drawn), the use of underwater sequences, which has us peering into the gloom in scary/excited anticipation, ramps up the suspense and the shark attacks are strikingly effective.
If you are not yet jaded by this formula, then this serves its purpose well, while if this is your first venture into such territory then the benefits are greater as a frightening scenario is intensely played out. But please, no more of these eh? There's only so much you can achieve with the premise... 6/10