If it looks like something that could transport you into the future, in a sense it is. A spaceship-sized hoop suspended from a helicopter is actually part of an advanced water detection system. The information it’s gathering, could help determine the future of California’s water supply – and where we store it.

“I’ve seen similar studies that say, ‘Hey, let’s not even think of building more above ground reservoirs. Let’s use all the empty space below,'” says Rosemary Knight, Ph.D., a professor of Geophysics and senior fellow at the Woods Institute for the Environment at Stanford University.