Heres a video of our expedition into the Hölloch - the largest cave system in Switzerland and Europe and one of the largest caves in the world. more than 10 hours with no sunlight to explore only the beginning of a more than 200 km long cave system.
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Get some more information here:
www.cyou.ch/central
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Негізгі бет HÖLLOCH | Cave Expedition in Schwyz
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