The endokarst landscape is the result of long erosion and sedimentation processes that have modelled an environment in which capricious forms abound. Despite being a hostile environment for human life, these caves must have attracted the attention of human groups from as early as the Palaeolithic. It is striking that many examples of rock art appear to be closely symbiotic with their natural support; nevertheless, it is difficult to confirm any relationship in the distribution of the decorated spaces, based on their morphology. Moreover, if we start from the hypothesis?widely accepted, but not demonstrated?that Palaeolithic cave art is a system of visual communication, the visibility of the art or the number of people who could be accommodated in the decorated sectors should be determining factors. In order to avoid making subjective appraisals when analysing these factors, we have designed a Python script with a workflow to work directly with 3D models of caverns using GISs, which can be easily replicated and edited by other researchers. Application of this script in the Magdalenian caves of Atxurra, Santimamine and Altxerri (Northern Spain) has allowed us to compare them accurately based on their visibility features. This has shown that in some cases, there may have been prior planning to enhance the visibility of some figures. In all cases, the groups of figures are located in deep and hidden parts of the caves, usually in sectors with limited capacity to accommodate people, which would be consistent with a system of restricted communication.Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This research was made within the project PID2019-107262GB-100 “Before art: social investment in symbolic expressions during the Upper Palaeolithic in the Iberian Peninsula” (PI Diego Garate) funded by MCIN/ AEI /10.13039/501100011033 (Spanish Ministry of Science, Innovation and Universities); the four-year multidisciplinary study project (2016–2020) “Study of rock art in Atxurra cave” led by Dr Diego Garate and funded by the Cultural Heritage Service of the Diputación Foral de Bizkaia; the two-year research project 021-KOI-2020 “Kobabes: kobazuloen dinamika eta labar artearen babesa” (PI Diego Garate), funded by Department of Culture and Linguist Politics of the Basque Government and the project “Ilunpetako sekretuak argiztatzen” (PI Iñaki Intxaurbe) funded with the grant “Barandiaran 2022” by the Jose Miguel de Barandiaran Foundation. I. Intxaurbe’s PhD research is funded by the grant PIF 19/196 (2019) at the University of the Basque Country (UPV/EHU). M.A. Medina-Alcaide has a Fyssen Foundation postdoctoral fellowship
