Coral Reefs in Crisis: What Underwater Drones Just Discovered

A fleet of small underwater drones has given scientists a clearer look at the health of coral reefs, and the results are troubling.

Using 3D mapping, researchers scanned Hall Bank Reef off the coast of Western Australia and uncovered widespread coral bleaching and structural decline. The drones, deployed without divers, created digital replicas of the reef floor, helping scientists monitor changes over time.

The technology allows researchers to track surface roughness, or “rugosity,” a key indicator of biodiversity. A loss in texture often suggests a loss in marine life. Experts say the data confirms that rising ocean temperatures and environmental stressors are overwhelming corals’ ability to adapt.

This new method allows for regular reef assessments, giving conservationists a better chance to respond in time. As coral bleaching becomes more common across Australia’s iconic reefs, including the Great Barrier Reef, efforts to slow the damage depend increasingly on tools like this.