Hranice Abyss
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Hranice Abyss is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic. In 2020 a scientific expedition revealed that the lowest reaches are sedime
Hranice Abyss
Pozzo del Merro
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Pozzo del Merro is a flooded sinkhole in the countryside northeast of Rome, Italy. Situated at the bottom of an 80 m conical pit, at 392 m it is the second deepest underwater vertical cave in the worl
Hranice Abyss
…September 2016, the ROV made by GRALmarine reached a depth of 404 metres (1,325 ft) without reaching the bottom. This surpassed the depth of Italy's Pozzo del Merro, which until then had been considered the deepest submerged chasm in the world with a maximum measured depth of 392 metres (1,286 ft). In 2022 UNEXMIN…
Pozzo del Merro sinkhole aerial view