Watched Reef [2010], by Andrew Traucki. I'm always willing to give shark movies a whirl and Reef is a fairly good one. It focuses on a group of friends whose sail boat capsizes off the Australian coast, and decide their best chance is to swim through potentially shark infested water to reach a nearby island. Reef benefits from being on the more realistic end of the scale, is fairly well paced, and does a good job at maintaining a level of tension throughout the film. The actors, whom were all unknown did a decent job with their character, but we never really get to know the characters all that well.