Calypso Corer (image) University of Hawaii at Manoa Caption This is Calypso corer onboard the Marian Dufresne II research vessel and iceberg in Scotia Sea in background. Researchers used this tool to uncover the first evidence for massive and abrupt iceberg calving in Antarctica, dating back 19,000 to 9,000 years ago. Credit Michael Weber Usage Restrictions For editorial purposes only 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.