500 million years ago life left this blue womb and colonized the land, but we are still intricately linked to the ocean. Our climates, coastlines, ecosystems, and economies are tied to the perpetual movement of water between continents. The great ocean currents are the arteries and veins of Planet Earth. This is the story of one particularly fascinating flow - the East Australian Current, a massive oceanic river that stretches the length of Australia's east coast.