In Cabo Delgado, Mozambique, the poverty of the population and the wealth of the subsoil remain irreconcilable, sweeping the lives of hundreds of miners. Marcelino ventures into the depths of the earth in search of ruby in a hole like the one where his brother died. Toni works in a mine where there is hardly any gold left. These are just two of the thousands of stories from this remote place on earth, but ... did you know that your health also depends on your work?