There can’t be many jobs more hellish than that given to three Chinese miners in the mountainous province of Yunnan in April 2012.
Tasked with cleaning out an abandoned copper mine in the county of Moijang, they found themselves in caves knee-deep in piles of guano — a foul-smelling combination of bat faeces and urine.
As horseshoe bats roosted overhead, and rats and shrews scurried around in the droppings and muck, the men dug for hours at a time in the stinking, airless space.