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is Patkov Gust at 553 m in the Velebit mountain, Croatia.
*Lamb Leer, Somerset, England, was entered by a 25 m pitch as early as the 17th century.
*Hranice Abyss, Czech Republic, is the deepest underwater cave in the world, the lowest confirmed depth (as of August 2022) is 519.5 m (450 m under the water level), the expected

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