Sampling Blue Water (image) National Oceanography Centre, Southampton (UK) Caption Oceanographic sampling equipment is shown being lowered into clear blue open ocean water. The clarity of the water is a consequence of low nutrient availability restricting the amount of planktonic microbes. Credit: Elizabeth Sargent, NOCS Credit Elizabeth Sargent, NOCS Usage Restrictions Credit: Elizabeth Sargent, National Oceanography Centre, Southampton 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.