Greenpeace Brazil started a partnership with the group of researchers GIAIA (a voluntary and independent group) to fill the gap of official information about the disaster caused by Samarco mining dam in Mariana district, Minas Gerais, Brazil. The researchers are comprised of biologists, microbiologists, toxicologists, zoologists among other specialists. They started their work few weeks after the dam collapsed, on November 5th. From December 6th to 11th Greenpeace followed their work to expose inconsistent information and evaluate social and environmental impacts.