Polymetallic Nodules with Plenaster craigi. White Line is 1 cm (image) University of Gothenburg Share Print E-Mail Caption These are polymetallic nodules with Plenaster craigi. White line is 1 cm. Credit The University of Gothenburg Usage Restrictions None Share Print E-Mail 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.