The Prehistoric Graphic Activity group has a cave with no known archaeological remains (although it contains some discreet paleontological evidence – mostly specific bear claws – and geological interest) to be able to study the technology used by the human groups in charge of carrying out the demonstrations. graphics during the Upper Paleolithic. This selection is due to the fact that this place shares the same geomorphological characteristics with numerous other decorated caves in the environment (Atxurra, Armintxe, etc.) and allows us to recreate the technological solutions used by prehistoric societies in graphic activity (illumination, painting and engraving, underground transit, etc.). The cavity has an express authorization for use issued by the relevant administration for carrying out archaeological studies, which led to the drafting of a collaboration and use agreement between the International Institute of Prehistoric Research of Cantabria and the Lekeitio City Council. In any case, the necessary measures have been taken to minimize the impact on the biological (mainly bat colonies) and geological heritage it contains, monitoring the underground environments.