Stock Photo - ***OCTOBER 7, 1974 FILE PHOTO***Hranice Abyss (Hranicka propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice. A group of divers from Olomouc Svazarm is working on a systematic speleological and hydrological exploration of the abyss near Hranice na Morave, Czechoslovakia, October 7, 1974. (CTK Photo/Vladislav Galgonek)

Stock Photo: ***OCTOBER 7, 1974 FILE PHOTO***Hranice Abyss (Hranicka propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice.

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