Folded drones may help Network Rail investigate its railway caves
![Prometheus drone with HAI_Dragonfly 360 3D-Camera](https://www.railtech.com/wp-content/uploads/2021/01/Prometheus_drone_with_HAI_Dragonfly_360_3D_Camera-960.jpg)
Mapping the unpredictable undulations of underground voids and searching out subterranean subsidence is a hidden but vital part of railway maintenance. Now engineers are auditioning a new player in the cast of solutions. Prometheus – from UK tech boffins Headlight AI – may have its inspiration in sci-fi, but it’s an entirely science-fact answer to a big and expensive question for railways around the world.
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