And can it be reversed? Narrator: The Great Barrier Reef is big. So big, in fact, that you can see it from space. David Wachenfeld: It's important for people to remember that the Great Barrier ...

It is often visible from outer space due to its immense size and vibrant colours. The Great Barrier Reef is critically ...

Many visitors say the Great Barrier Reef is best seen through ... Known locally as the Outer Barrier Reef, these reefs are ideal for first-time divers and families because of the one- to three ...

the Great Barrier Reef is 2,300km long -- roughly the length of Italy -- and is the only living organism that can be seen from space. When Veron, a former Chief Scientist at the Australian ...

Dugongs and sea turtles swim in the waters around the island. Part of the outer Great Barrier Reef, Wheeler Reef lies some 40 nautical miles off the coast of Townsville. Wheeler Reef is off the beaten ...

There is fierce rivalry for space, for food and for a partner ... causing it to let down its defences. On the Great Barrier Reef a remarkable grouper uses sign language, dubbed the headstand ...