— — the deepest dark known to be measured.
“The deepest known cave on Earth. A vertical shaft system descending more than two kilometres into the limestone of the Arabika Massif, above Gagra on the Black Sea coast. The entrance is unremarkable. The bottom is a sump in absolute dark. Caving teams have worked the system since 1968.
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Veryovkina Cave sits in the Arabika Massif of the Western Caucasus, in the Gagra District of Abkhazia, above the Black Sea coast of Georgia. The entrance was discovered in 1968 by the Perovo-Speleo team from Moscow. After decades of expedition work the cave was surveyed to a depth of 2,212 metres in 2018, making it the deepest known cave on Earth, surpassing the nearby Krubera-Voronya Cave a few kilometres away in the same limestone plateau.
Below about 200 metres the cave holds permanent darkness and a temperature near 4 degrees Celsius. The descent is almost entirely vertical, rigged with rope through narrow meanders and broad shafts. An expedition to the bottom takes roughly a week of camping at staged underground bivouacs. The terminal sump is fed by groundwater that resurfaces in springs along the Black Sea coast, traced by dye studies linking the massif to the Reproa spring near Gagra.
Veryovkina is not a tourist cave. Access requires permission from local authorities in Abkhazia, full vertical caving competence, and weeks of logistics for any descent past the upper meanders. The Arabika Massif itself is reached from the Gagra coast, with the entrance plateau sitting above 2,200 metres. The system was nearly catastrophically flooded by a sudden 2018 inrush that forced an emergency retreat by a Russian-led expedition.