Five friends are stranded when their boat is torn open on the Great Barrier Reef, leaving them to face an unthinkable decision: wait on the capsized boat for help that may never come or swim for a distant island through shark infested waters. The Reef is a low budget effort from Australia that blows any recent shark movie competition right out of the water. It is based on the true life story of Ray Boundy, the sole survivor of the real tragedy. The amount of tension build-up in this is excruciating. It taps into very primal fears of the unknown, unseen lurking in the deep blue sea, as well as being put back on the food chain and literally eaten alive. The acting is all solid. This was also filmed with a real Great White shark, no CGI, giving it a more authentic feel. A relentless and extremely effective thriller that I highly recommend.