The Age of Drones for Infrastructure Inspections Picture yourself on a bridge in the wind, gazing down at churning water 200 feet below. Down somewhere below, someone must drop a sensor to detect vibrations and water pressure. Previously, this would have involved sending a technician down or hiring a costly boat crew, and this was risky and time-consuming. Now imagine a drone flying smoothly over the same location, descending, and releasing a small specially designed sensor p