Tunnel "Vrata" is a part of the Rijeka—Zagreb high way, section Oštrovica—Vrata. Right tube of the tunnel "Vrata" is 262 m long. During excavation works for the right tunnel tube, underground hall (cavern) was found along the tunnel cross section, and outside of it as well. The longest hall cross section which is parallel with tunnel, in horizontal projection is 51 m long. Total volume of this caving object is estimated to be approx. 55,000 m3, but most probably this cavern and the cave channel are going further along the fault, above the narrow and covered up fissures under the talus material. Investigations, design solution, numerical simulation, remedy works and monitoring of the caving object remedy works are shown in this paper.

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