The following description was translated from UnoDeAventuras.com by Google Translate:
The Underno's cannon is a essential descent in the Canyoning of Brazil. Technical and Aquatic Canyon; With narrow and winding gorgas. The waterfalls allow rappel out of the water but their flow; Always high; demands attention. Several very aesthetic intermediate corridors and large final waterfall; We will rappel out of the water. Many of the waterfalls allow jumps at deep bladinas.
Approach
Descent
Exit
Red tape
Unknown. Descent in National Park; Consult the legislation before starting the activity.