Coral Core (IMAGE) University of North Carolina at Chapel Hill Caption Once a coral core is drilled, the hole is filled with concrete and sealed with epoxy to prevent bio-eroding organisms from damaging the coral colony. Credit Justin Baumann Usage Restrictions Photo may be used as long as credit is given. 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.