A way to understand the interior of rubble - how many voids are forming and the size of the voids. This is critical for designing robots to locate trapped survivors and should also help civil engineers. From CMU Robotics Institute, Ananya Rao has been “stacking” the “layers” from each day’s drone digital surface mapping by FSU Emergency Management and Homeland Security Program flights at the Surfside Miami collapse. Think of it as figuring out the holes in a block of Swiss cheese by looking at the slices.