Ce trebuie să știi

At its peak in 1920, 1.1 million people were employed in the UK coal-mining industry, with more than 1,300 mines across Britain producing nearly 300 million tonnes of coal for domestic and industrial use. Mining was, and remains, a dirty, dangerous and complex engineering task, extracting a raw material at depths of up to 1,400m below the surface, the shafts spreading out for miles beneath town and country.