ESnet Dark Fiber (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption A research team led by Jonathan Ajo-Franklin of Berkeley Lab's Earth and Environmental Sciences Area is turning parts of a 13,000-mile-long "dark fiber" testbed owned by DOE's ESnet into a highly sensitive seismic activity sensor. L-R: Inder Monga, Verónica Rodríguez Tribaldos, Jonathan Ajo-Franklin, and Nate Lindsey. Credit Paul Mueller/Berkeley Lab Usage Restrictions Credit Paul Mueller/Berkeley Lab License Licensed 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.