The Bulz water cave from the lower basin of Hells’s Valley, represents the ascending spring waters of Ponor-Sancuta Cave and Ponor karst depression, which make up one of the most impressive karstic systems from the Mountains Philanderer’s Forest.
The cave, emergence of a course with strong underground flows, is a unique corridor, ascending, with many obstacles along the way. The cave is developed in limestones, situated at the border between the lower and middle triassic, and has a total length of 4500 meters. The entrance, of 6/4 meters, is occupied entirely by an underground lake. The first large room of the cave has a length of 13 meters and it’s not accessible only with an inflatable boat. Water enters this room through a 2 meter high waterfall, that is at its southern end, but which can be circumvented on the right side of the gallery. After a relatively horizontal sector, we find the Waterfall II, 3 meters high, followed by a western sector of 8-10 meters high and whose floor is submerged.
From a point at about 100 meters from the entrance, the gallery slightly widens up to 5-6 meters wide, and the water turns into a lake of more than 2 meters in depth. At the end of the lake, is the Waterfall III, 3 meters high, and it can be distinguished on the walls, signatures dating back from the 19th century.
For escalation of Waterfall III is required a fixed scale. The advance is made on the stream, the water having varying depths, and the walls show levels of erosion and sometimes calcareous concretions. Covering a long area of the corridor with water, you reach the Great Wall with a height of 8 meters, allowing to visit an upper portion of the cave. The waters that come out through the Siphon I disappear at a higher level (8 meters) through a remarkable circular sorbate. Hence the cave widens considerably (up to 8-10 meters). The corridor ends with a lake over 20 meters wide and more than 3 meters deep, at the end of which the ceiling continues, obliquely, underwater (Siphon II). The cave was further explored.It represents a great interest in researches of sedimentary petrology and genesis.
The visitable section is currently under difficult conditions of access, having a length of only 548 meters (out of a total of 1177 meters). The fact that beyond Siphon II – overcome by scuba divers – the cave continues under a vade regime, having a vast network of galleries unaffected by human impact.
Its morphology, was far from arabesques possess specific to strong concretion caves, it is sober and stately.