Caption: Westerly view of the Great Barrier Reef margin offshore Cairns, North Queensland, showing submarine canyons and landslide scarps. Inset shows the approx. 1 cubic km perched block in 340 to 470 metres water depth.

Licence: This image is released under the Creative Commons Attribution 3.0 Australia Licence. http://creativecommons.org/licenses/by/3.0/au/deed.en

Attribution: Dr Robin Beaman, James Cook University