Ever wondered how we measure the shape and complexity of a coral reef? This clip shows our Stereo Video System (SVS) in action, a paired-camera method we use along our 50-metre transect lines to capture the reef in 3D. It gives us a clear picture of how the reef’s structure changes over time, from shifting topography to new growth and recovery. Reef complexity is a key indicator of ecosystem health. More structure means more hiding spaces, more habitat, and more life; and that’s why its an impor