Steve and the team travel to the Auyan Tepui and descend into days of darkness as they explore a labyrinth of caves inside the tepui. But when they emerge they find an exhilarating view -- and have the thrill of rappelling down alongside the world's highest waterfall: Angel Falls.

Steve and the mountain climbing team contend with river rapids, dangerous insects and a grueling march through dense jungle, before climbing a previously unscaled Tepui in South America. Will they be able to scale the Amaurai Tepui, or will nature and the weather have other ideas?