Albert Einstein's Theory of General Relativity predicts that gravitational waves travel across the universe at the speed of light, but he also predicted such waves would never be observed. Researchers around the world are hoping to prove him wrong, about the detection that is, with experiments such as the LIGO Scientific Collaboration. Researchers from the Deep Underground Gravity Laboratory, or DUGL—pronounced DOO-guhl—have installed sensitive instruments in the Sanford Underground Research Facility to determine whether it is suitable for a large gravitational wave experiment.