Flying below the surface : drone technology and AI are transforming large-diameter pipeline inspections / Matthew Kiefer and Alison Gale.

Abstract: When it comes to assessing the conditions of large-diameter sewers and tunnels, in particular, drones have much to offer, including reduced risks associated with human entry and lower overall costs. Still, drone-based inspections present challenges. This article looks at their current capabilities, limitations, and real-world performance.