In today's technological age - is heavy manual labour disappearing or is it just becoming invisible?Physical work was once celebrated with hymns of praise. But workers today must be content with encouraging one another that their hard work is better than no work at all.This series looks at the state of physical work in today's world. Work that is dreary, demanding and at time dangerous. An unflinching portrait of physical work in the 21st century. 'Heroes' looks at freelance miners in Ukraine who spend long days crawling through cramped shafts of exhausted coal mines to dig out a living for themselves.