Dr Jens Schneider von Deimling (IMAGE) Kiel University Caption With this echo sounder (NORBIT multibeam echo sounder) optimized for shallow water, geoscientist Dr Jens Schneider von Deimling and the research team examined the seafloor down to centimeters. The detection of the pits has only therefore become possible in recent years. Credit © Claudia Rositzki Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.