S1, E4: A mighty army of dolphins, sharks, whales, seals and gannets hunt down billions of sardines along South Africa's east coast each winter. This is the Sardine Run: an underwater armageddon, the greatest gathering of predators anywhere on the planet, and the most spectacular event in the world's oceans. Pioneering a unique boat stabilised camera mount for surface filming, the crew capture all the high octane action as the predators compete for sardines, filmed with aerial, underwater and above water cameras.