University of Glasgow, England, 1763. A young engineer tries, in vain, to fix a steam engine before finally understanding what is wrong with it. James Watt still doesn’t know it but he will soon revolutionize the world of industry. From the end of the 18th century, in the depths of the earth, night and day, men scrape, prick and dig interminable and dangerous galleries. True soldiers of the abyss, miners tirelessly pull coal, the main source of energy of the country, up to the surface. This black rock will become the vital fuel of the industrial revolution. The whole Europe will be transformed by the coal revolution but at what price ?