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A 203 m deep abyss on the Jasov plateau, a national natural monument since 1996. In 2010 the divers Daniel Hutňan and Radek Husák (Prague) dived the Ruženino jazero lake at −150 m below the entrance, after cavers had widened squeezes to carry the diving gear down; narrow passages stopped them from reaching the hoped-for spaces beyond. They also took water samples from the lake.
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