Breaking glass spheres (IMAGE) Royal Netherlands Institute for Sea Research Caption Breaking glass spheres which generates sounds at a level that marine mammals use at great depth, which are then recorded from tens to hundreds of kilometers away. Credit NIOZ Usage Restrictions - License Original 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.