4th Expedition Tocantins (BR): "En Route to the Unknown"

Emerson Gomes Pedro, Bárbara E. P Fonseca Rodrigues, Paulo R. Simões, Paolo Valsecchi do Amaral, Alécio Pereira Junior, Luiz Afonso Vaz de Figueiredo, Renê de Souza, Anselmo Rodrigues, Linda and Linda Gentry El-Dash

The Brazilian Society of Speleology (SBE) conducted their fourth expedition to the state of Tocantins, location of the geodesic center of Brazil, in January of 2007.