QUOTE : The strains of the work are intense, the lifespan of the machines short. ‘When one of them reaches the end of its useful days,’ says Neil, ‘it’s not cost-effective to bring it back up. It’d take the place of ore in the upshaft, and that’s too expensive. So instead the machine gets driven into a worked-out tunnel of rock salt, and abandoned there. The halite will flow around it as the tunnel naturally closes up.’ It is an astonishing image: the translucent halite melting around this cybernetic dragon – the fossilization of this machine-relic in its burial shroud of salt. I remember the pit ponies about which Emile Zola had written, brought down as foals into France’s great nineteenth-century coal mines. The foals would not see daylight again. They grew in the mines, were fed there, were worked to death there, and their stunted bodies were left in side tunnels, awaiting the burial of collapse.