This may sound scary, but it's a lot more "laid back" than it seems. Participants dive within relatively warm waters and, protected by a massive cage, are immune to any of the sea's dangers. But when that dreaded beast approaches, mouth wide open displaying endless rows of sharp teeth, no matter how jaded, the diver in question is bound to react with a racing pulse. Where can one experience such a rush? The best place to go is "shark-alley" near the fishing village of Gansbaai in South Africa where the whites abound like nowhere else in the world. He who dares to face the dreaded one is guaranteed a hauntingly memorable experience.