The Postojna cave, the longest karst cave in Slovenia, counting 20 km of dry, aqueous and poured over steels corridors. It is a pearl of the Karst, the land stretching out between Postojną and Triestem, where profusely natural rare occurrences are appearing: caves, chasms, disappearing rivers and drying lakes. Some of these phenomena, ensuing as a result of rinsing soluble calcareous rocks out, were described in Slovenia for the first time, of herds Slovenia is also regarded as the land of classical karst forms.
Fragments of corridors in the year 1818 uncovered corridors of the Old Cave living in these surroundings Cec Gap. Very entry to the cave was known much earlier, inscriptions are attesting to it on walls of entrance corridors, that the cave was being penetrated already in the XII century.
The first underground railway was built in 1872. In 1884 natural ways of lighting the inside of caves with the help of the torch, candles, oil and acetylene lamps were replaced with the electric lighting.
In 1967 a two way underground railway was built.
Stone tools found in the cave let archaeologists establish that a primitive man inhabited both the Postojna Cave, and different local caves before over 50 thousand years what numerous discovered here bones of extinct animals are attesting, to among others of cave bear.
Many cave animals live in karst underground world of the Postojna cave rare species of beetles, spiders, crickets, crayfish, woodlouses. From them an olm is most interesting - caudate amphibian.
His body of the length to 30 cm is whitish or pink, eyes are hidden under the skin, he is breathing feathery, outside gills. He lives till 100 years and to find him it is possible only in underground waters of the Karst of Dynarski, where is feeding microscopically on short creatures. Specimens being in a showpiece basin stay in it but through two months, then they are coming back to the freedom and they are being replaced for consecutive season different.
A fixed temperature is ruling in the cave, an about 10 C Sr. is a winter and a summer. however Air is being changed depending on the season. In the summer he is dragging the cold air from the inside of the cave, in the winter whereas outside air is blowing warmer air off from the cave through cracks and cracks in the roof.
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