Electromagnetic Field Testing (image) DOE/Pacific Northwest National Laboratory Caption PNNL's Marine Sciences Laboratory in Sequim, Wash., has this experimental setup to expose aquatic animals to an electromagnetic field created by the two large red Helmholtz coils pictured here. The field is similar to those created by marine power devices installed in the ocean. Credit Pacific Northwest National Laboratory Usage Restrictions Credit PNNL. 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.