The Great Barrier Reef: a catastrophe laid bare

Australia's natural wonder is in mortal danger. Bleaching caused by climate change has killed almost a quarter of its coral this year and many scientists believe it could be too late for the rest. Using exclusive photographs and new data, a Guardian special report investigates how the reef has been devastated - and what can be done to save it

It was the smell that really got to diver Richard Vevers. The smell of death on the reef.

"I can't even tell you how bad I smelt after the dive - the smell of millions of rotting animals."