Flooded sinkhole near the town of Hranice, Czech Republic
Hranice Abyss
Hranice Abyss (Czech: Hranická propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic. The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater.[1][2] In 2020, a scientific expedition to the cave revealed that part of the system apparently reaches 1 kilometre deep, albeit with the lowest reaches sediment-filled. Analysis of the water found carbon and helium isotopes which implied that the cave has been formed by acidic waters, heated by the mantle, welling up from below.[3]
^"Exclusive: Deepest Underwater Cave Discovered". National Geographic Society. Archived from the original on 1 October 2016.
^"Hranice Abyss is believed to be 1200 m. deep (in Czech)".
^"SCIENCEMAG: The world's deepest freshwater cave just got a whole lot deeper".
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