Every year millions of visitors travel by way of fins, flippers and feet to see one of the seven wonders of the natural world: the Great Barrier Reef – a living treasure trove of biodiversity. There is still so much to learn and knowledge is the key to understanding more about this living Eden. A thriving metropolis populated by a cast of characters straight out of an adventure novel – heroes, bad guys, sidekicks, lovers and clowns – they're all players in this vast underwater drama.