Following his visit to the Great Barrier Reef in 1957, naturalist and broadcaster David Attenborough returns and uses the latest filming techniques to unlock the secrets of the natural wonder.

Dive into the incredible world of Australia's Great Barrier Reef, as Barney discovers creatures that are quirky, crazy and creepy! Watch all your favourite ABC programs on ABC iview. More from ABC We ...

In this second episode, David Attenborough continues his exploration of the Great Barrier Reef, aboard the research vessel Alucia. He discovers the creatures that visit the reef every year ...