Hranice Abyss
The deepest flooded pit cave in the world, it is a karst sinkhole. The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater.
The deepest flooded pit cave in the world, it is a karst sinkhole. The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater.