Under the Sea: The Great Barrier Reef

Iolo Williams explores Australia's Great Barrier Reef in a bid to understand if the reef and the myriad of life it supports will survive for future generations.

Iolo Williams looks at the devastating effects of coral bleaching and tropical cyclones, but also uncovers incredible signs of regeneration and an abundance of marine life.

Iolo examines the changing face of the reef over the past 15 thousand years, building a picture of how the reef was formed and asks what part we can all play in the reef's future.