Recent images taken from aerial surveys show severe damage to the world famous Great Barrier Reef.
Coral bleaching, a term meaning the loss of algae is affecting almost 900 miles (1448 kilometres) of reef.
Experts are suggesting the reef has little chance of recovering and blame global warming for the looming catastrophe.
The bleaching is caused by rising water temperatures said to be a result of global warming. Even if action is taken now to reduce greenhouse gases, it could take decades for the reef to recover.
If the reef dies, the ocean will lose many fishes and other creatures that call the Great Barrier Reef Home.