Above the Celjska koča piste at the very peak of Tolsti vrh, about 2m from the registration box and hiking trail stamp, lies the entrance to the 10-metre deep chasm with a total tunnel length of 20m.

It was named after the peak. No karst formations are visible inside the chasm.

However, a draught can easily be felt, which indicates that the underground tunnels are somehow connected to the surface.

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