The world's oceans are filled with an array of venomous and toxic marine critters, not to mention a whole host of apex carnivores. Join ace divers and photographers Nick and Caroline Robertson-Brown as they tour the world in search of the 50 deadliest sea creatures. Animals covered come from all around the globe and include jellyfish, sea snakes, blue-ringed octopuses, lionfish, pufferfish, stingrays, cone shells, leopard seals, orcas, crocodiles and, of course, a whole range of sharks. And there's an intriguing twist in deciding just which one is the most deadly!