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Even many local residents do not know the existence of the great Cave system at the foothills of József-hegy, which is the part of the Thermal Karst of Buda. The Cave is the water passage of the sources feeds Malom-tó, which is the fifth part of the huge Cave systems of Rózsadomb, but the only active one. Most of the system is underwater, so it is approachable only for divers. It gets the hot water from the depth and the cold water from the karst water comes from Buda hills. The cave got its name from that chemist, who started to discover the cave system during the 1850’s. He explored the anhydrous parts and presumed the underwater cave system. Also analysed the water of the cave. The cave was researched from the 1930’s, but the most important discovery was in 2002, when divers reached the biggest thermal underwater dome-shaped hall of the world (its 20-25 metres high and now partly over water level). This hall was opened in 2008 with drilling, but at the moment it is not open for any visitors, only with permission. As the result of the continuous discovery the known length of the system is 6 kilometres and its depth is 80 metres underwater. But it is sure, that the whole system is bigger, because there are more points, where diver cannot get further, because the limit of the human potential and the diver technological possibilities. The discovery of the János Molnár Cave has a great scientific importance, because the emergence of the thermal water cave systems could be searched perfectly through an active system.
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