On November 5th, a dam full of residual mud from iron ore mine, owned by Samarco - a joint venture of the mining giants BHP Billiton of Australia and Brazil's Vale, burst and 62 million cubic meters of contaminated mud and mine waste started its deadly 800 kilometers descent towards the Atlantic Ocean, through the river system of the states of Minas Gerais and Espirito Santo. The disaster claimed the lives of 19 people, more than 1,200 people were left homeless; at least 1,469 hectares of land were destroyed, including several national parks and protected areas. We decided to descend the river to the Heart of Darkness.