Environmental monitoring of marine energ (IMAGE) DOE/Pacific Northwest National Laboratory Caption Researchers deploy hydrophones to measure underwater noise generated by a tidal turbine. Credit Photo by Jayson Martinez | Pacific Northwest National Laboratory Usage Restrictions None 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.