Ridley Scott inspires Network Rail’s cave-exploring drone

In a well-known scene in the science-fiction blockbuster, four spherical drones whizz off into a creepy, unexplored alien structure, scanning it with lasers as they go in order to build up a 3D model of the environment. It’s a tantalising moment in which the human space travellers realise the enormous scale of the outlandish place they have stumbled upon.

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