The teams’ mission is to discover the Essequibo’s source which is hidden deep in the Acarai Mountains on the border to Brazil. However, the last leg turns out to be the most challenging: not only do the experts have to deal with the unpredictable moods of Mother Nature, but also with the dense jungle and finally break-out of fever in their camp. Will they have to end their expedition before finding the mysterious source of the Essequibo that belongs to the last blank spots on the world map?