Traces of industrial archaeology have been found in a nameless cave on the left bank of the Krka River next to Skradinski buk, on the northwestern side of the ruins of the Jaruga I hydroelectric plant.
The cave was discovered in 1894 at the time of construction of the plant. According to the available information, at that time, the cave was about 150 m long, 80 m wide and with a total area of 1,200 m2, richly ornamented with fantastic dripstones, with a small lake at the bottom. The cave was formed by the deposition of travertine. Today, the lower parts of the cave have been filled in, and it is now only 24 m long and 10 m deep. The dripstones have since lost their shine and the lake has dried up due to the diversion of the river during the construction of the hydroelectric plant. Remnants of the foundation of the hydroelectric plant can be seen in part of the cave.