Barney Harwood and Gemma Hunt discover the world of Australia's Barrier Reef. It has the greatest collection of animals on the planet and they're all linked to each other in weird and wacky ways. These crafty creatures know that deep in the ocean depths they need some cool confidence tricks to stay alive. From the dressing-up decorator crab to the sneaky snake eel, these con men know they need to trick or be tricked. But just how far do they go to stay alive?