On the evening of September 29, 2017, a group of cavers hiked in the Mátyás-hegyi Cave, which is part of the longest cave in the country, the Pálvölgyi Cave System in Budapest. Nearly half an hour's way from the entrance, (about 500 meters), in the middle section of the deep zone, between Nagytravi and Opera-Nagytravi they climbed down a narrow chimney, where they secured each other during the climb so that no one could fall.
At the end of the chimney, at about one and half meter from the bottom, a young lady was clinging to an upper catch and suffered a shoulder strain.
The tour guide - who is a trained cave tour and research leader - took action to alert the cave rescue service.