The Hungarian Cave Rescue Service received a call out on the 6th of November, 2015, Friday afternoon that an accident happened in Csengő pothole (Bell-cave) lying in Slovakia Plešivecká plateau (near Roznava). Three Hungarian individuals (industrial alpinists, who did not have the technical qualifications for vertical caving) descended into the cave without official permit and not under organized circumstances. They allegedly wanted to spend more days in the cave.
The pothole starts with a large, hundred-meter deep vertical shaft, where a larger ledge can be found at-60 meters. The bottom of the cave is a vast, fragmented gallery.
Descending, Mr. B.G. (36 years old) went first, installing the ropes in the cave. Halfway through the shaft on the ledge (supposedly due to saving some rope) he did not install a belay line and walked through the ledge without any belay.