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Ice caves, classified as permafrost phenomena, serve as climate archives that reflect environmental changes. In Slovenia, over 230 caves with perennial ice have been documented, including the Snežna Cave, which has been the subject of numerous studies in recent years. It is known that there is significant ice loss during summer and weak accumulation in winter, but there is a lack of information on the total ice cover and internal structure. Therefore, ground penetrating radar (GPR) was used to investigate the ice thickness and internal structure of the ice body in Snežna Cave. The GPR profiling revealed an ice thickness of up to 9 metres, which has the shape of a depression with steep edges. Despite strong reflections from the cave walls and debris, the boundary between ice and bedrock could be determined with high accuracy in most profiles. The results of the study provide a basis for future calculations of ice mass and monitoring of volume changes.