It's an ocean of giants. South Africa has a dramatic, rocky coast that's raked by churning currents. Warm, cold, rich and murky water collide to create shark central, with enough food to sustain the biggest. The cast is a who's who of the most notorious: Great White, Tiger, Bull, Ragged tooth, and the biggest of the lot - the Whale shark. It's a rare chance to celebrate and study these iconic sharks. This is a high-speed journey into the realm of Big Sharks. Who are they? How do they survive? Why are they here, and how did they get so big?