Vrtoglavica Cave
Vrtoglavica Cave (also Vrtiglavica, from Slovene vrtoglavica 'vertigo') is a cave located inside Mount Kanin in the Slovene part of the Julian Alps, near the border between Slovenia and Italy. The cave holds the record for having the deepest single vertical drop (pitch) of any cave on Earth, at a depth of 603 metres (1,978 ft).[1][2]
The total depth of the cave is 643 m. It contains one of the tallest cave waterfalls in the world; the estimated height of the falls is 400 to 440 m. It was discovered in summer 1996 by Italian speleologists and the bottom was reached on 12 October 1996 by a joint Slovene-Italian expedition.[3]
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Coordinates: 46°21′N 13°26′E / 46.350°N 13.433°E