When the Popocatepetl volcano reawakened in 1994, Mexican scientists needed people in the area who could be their eyes and ears. State police helped them find one, Nefi de Aquino, a farmer then in his 40s who lived beside the volcano. From that moment on, his life changed.
He became a police officer himself, but with a very specific job: watching Popocatepetl and reporting everything that he saw to authorities and researchers at diverse institutions.
