Corals at Risk on the Great Barrier Reef (IMAGE) California Academy of Sciences Caption Although deep reefs are often considered a refuge from thermal anomalies, this new study argues that both shallow and deep reefs are under threat of mass bleaching events. A team of scientists focused on the mass bleaching event in 2016 that caused the death of 30% of shallow-water corals on the Great Barrier Reef. The study details how the impacts of this bleaching lessened over depth, but were still substantial on deep reefs. Credit © Pedro Frade Usage Restrictions Credit is mandatory. Editorial use only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.