Sometimes it takes a fish to do a man’s job. Scientists at the Pacific Northwest National Laboratory have developed a sensor-laden, synthetic Sensor Fish that can be used to swim into hydropower facilities like dams to evaluate structures and other environmental systems. Using Sensor Fish, PNNL researchers say they can measure the various forces juvenile salmon experience as they pass through dams. The Sensor Fish initially was designed to evaluate dams equipped with a common type of turbine along the Columbia River, the Kaplan turbine. The pressure change, they found, is akin to traveling from sea level to the top of Mount Everest in blink of an eye, the PNNL researchers said in a release.