# Veryovkina Cave plunges 2,212 meters beneath the Caucasus near the Black Sea, a descent nearly seven Eiffel Towers deep that takes cavers four days through icy waterfalls and immense shafts, ending in chambers where darkness, exhaustion and sensory deprivation can make the human brain generate flashes of light > By lowering a weighted line into a remote underground lake, explorers from the Perovo-Speleo Team extended the measured depth of Veryovkina Cave to 2,212 meters in March 2018. Their expedition report described a vast system of shafts and flooded passages hidden beneath... Canonical URL: https://www.argo.net/veryovkina-cave-plunges-2212-meters-beneath-the-caucasus-near-the-black-sea-a-descent-nearly-seven-eiffel-towers-deep-that-takes-cavers-four-days-through-icy-waterfalls-and-immense-shafts-ending-in/ Byline: Perovo-Speleo Team Published: 2026-07-10T00:02:55+00:00 Categories: Earth ![Deep limestone cave shaft with a wooden ladder](https://www.argo.net/wp-content/uploads/2026/07/deep_vertical_cave_shaft_caver.jpg) By lowering a weighted line into a remote underground lake, explorers from the [Perovo-Speleo Team](https://incave.org/2024-2/) extended the measured depth of Veryovkina Cave to 2,212 meters in March 2018. Their expedition report described a vast system of shafts and flooded passages hidden beneath the Arabika Massif in the western Caucasus. The measurement placed **Veryovkina Cave** among the deepest known caves ever explored. Its vertical extent is roughly seven times the height of the Eiffel Tower. Reaching the bottom requires days of rope work through cold water and darkness, followed by an even more exhausting climb back toward daylight. Veryovkina also offers scientists and explorers a rare view into an extreme underground environment. Its deepest passages reveal how water carves thick limestone over geological time. They also expose people to cold, isolation, fatigue and prolonged darkness at levels rarely experienced on Earth's surface. ## A record measured at 2,212 meters The cave's final measurement depended on the depth of a water-filled passage at its lowest known point. During the March 2018 expedition, team member Evgeny Kuzmin entered the terminal lake and used a sounding line to measure 8.5 meters of water beneath him. Adding that depth to the surveyed route produced a total vertical range of **2,212 meters**. Pavel Demidov's expedition report states that the terminal-lake measurement increased the cave's total surveyed depth to 2,212 meters. The result was based on a connected survey extending from the entrance to the lake. Survey points throughout the cave allowed the team to track changes in elevation as the route twisted through shafts and horizontal galleries. A cave's depth is the vertical difference between its highest known entrance and its lowest surveyed point. The length of every tunnel can be far greater because passages may curve, double back, or run horizontally. In Veryovkina, explorers mapped kilometers of galleries near the bottom after descending more than two kilometers from the entrance. The entrance sits at an elevation of about 2,285 meters in the Caucasus. It appears as a modest opening on a remote mountain slope. That small surface feature gives little indication of the immense vertical network below. ## How explorers mapped the descent Soviet cavers from Krasnoyarsk first examined the opening in 1968. They reached a depth of about 115 meters before their route ended at an obstruction. Later teams returned during the 1980s and pushed the surveyed depth to approximately 440 meters. Exploration slowed during the upheaval that followed the collapse of the Soviet Union. The Perovo caving community eventually resumed sustained work in the system. Beginning in the 2000s, repeated expeditions uncovered routes that earlier visitors had missed or lacked the equipment to pursue. The breakthrough required patient digging and careful route finding. Cavers squeezed through narrow points, descended new shafts and mapped each newly opened section. By 2016, the explored depth had passed one kilometer. Expeditions in 2017 reached beyond 2,000 meters and found extensive galleries near the bottom. A modern **cave survey** combines distance measurements with compass bearings and vertical angles. Each measurement links one survey station to the next. When thousands of these connections are assembled, they create a three-dimensional representation of the cave and establish the elevation of its deepest point. The official Veryovkina survey incorporates work conducted between 1986 and 2018 by the Perovo-Speleo Team and the Perovo Caving Club. The resulting map shows a complex route with steep shafts above and a broad network of lower passages shaped by flowing water. ## Why Arabika produces giant caves The cave lies beneath the **Arabika Massif**, a limestone mountain block near the Black Sea. This compact region contains several exceptionally deep caves, including Krubera-Voronja, Sarma and Snezhnaja. Their concentration reflects an unusual combination of thick soluble rock, high relief, fractures and abundant water. Much of Arabika consists of carbonate rock deposited in ancient seas during the Upper Jurassic and Lower Cretaceous periods. Those sediments hardened into a limestone sequence more than two kilometers thick. Later tectonic activity raised and fractured the rock as the Caucasus developed. Rain and melting snow absorb carbon dioxide from the air and soil. The resulting weak carbonic acid enters cracks in the limestone and slowly dissolves the rock. Tiny fractures widen into conduits, while connected conduits grow into shafts and chambers. Over millions of years, this process creates a **karst landscape**. Water follows gravity through the mountain toward lower outlets. Arabika's limestone slopes toward the Black Sea, giving underground drainage enough vertical space to develop cave systems with extraordinary depth. The cave continues to change as water moves sediment and enlarges selected passages. Collapses can block older routes or expose new ones. Explorers therefore encounter a geological system whose present shape records many stages of erosion, uplift and underground drainage. ## Four days through cold and water Reaching Veryovkina's lower galleries generally takes about four days under favorable conditions. Cavers descend one rope after another while carrying food, sleeping equipment, lights, batteries, surveying instruments and emergency supplies. Equipment travels in tough waterproof bags attached to the climbers. The route includes a succession of vertical drops. Some require long sections of **fixed-rope descent**, with cavers hanging freely away from the rock. A single pitch can extend for more than 100 meters. Each person must control the descent while managing equipment and avoiding loose stone. Underground camps divide the journey into manageable stages. Camps have been established near depths of 600, 1,300 and 2,100 meters. These sites allow team members to eat and sleep before continuing. Comfort remains limited because surfaces are wet, space is restricted and equipment must remain organized for safety. Demidov's expedition account says the team reached Camp 2100 on the night of March 1 after traveling through the cave for three days. From there, the team explored and surveyed the deepest passages. Temperatures remain close to 4 degrees Celsius, while humidity approaches saturation. Water runs down walls and ropes throughout much of the route. Prolonged contact with **near-freezing water** draws heat from the body and makes dry clothing difficult to preserve. Fatigue compounds the danger because the return trip requires cavers to climb every vertical rope they descended. ## The flood risk below 2,000 meters Surface weather can transform conditions far underground. Rainwater enters openings and fractures across the massif, then funnels into the cave. Narrow passages concentrate that flow. Water levels may rise rapidly in lower galleries when heavy rain reaches the underground drainage network. During a September 2018 expedition, a **flash flood** swept into Veryovkina's deepest passages while team members were camped near 2,200 meters. Cavers higher in the system relayed a warning. The lower group began an emergency ascent as water surged through sections of the route. The escape took more than 16 continuous hours, according to accounts from the expedition. Rising water filled passages that had been manageable during the descent. The team climbed through waterfalls and strong currents while moving equipment toward higher ground. Everyone reached safety. Flood danger becomes especially serious in vertical caves because water and people often use the same narrow route. A dry shaft can become a waterfall. A low passage can become submerged, while a calm chamber may collect water from several upstream branches. Weather monitoring and underground communication provide crucial warning time. Teams also consider seasonal snowmelt and recent rainfall before entering. Even with those precautions, the distance from the surface limits how quickly people can respond. A storm that lasts several hours above ground can create a much longer emergency for cavers deep below. ## What total darkness does to perception Sunlight has never entered Veryovkina's deepest chambers. When cavers switch off their lamps, the visual environment becomes completely dark. There are no stars, distant buildings, or traces of scattered atmospheric light. Artificial lighting provides the only reliable visual reference. Prolonged **sensory deprivation** can produce flashes, colors, drifting shapes, or apparent movement. Such experiences are often described as phosphenes. They can arise from activity within the eyes and nervous system even when external light is absent. The brain continually interprets electrical signals from the retina and other sensory organs. In darkness, the **visual cortex** receives far less structured information. Random retinal activity and normal neural firing can then become more noticeable. Fatigue, stress, disrupted sleep and isolation may intensify the experience. Reports from extreme cavers describe apparent sparks or patches of light after long periods underground. These accounts resemble phenomena recorded in other low-stimulation environments. Controlled research would be needed to determine how often such perceptions occur in Veryovkina and which conditions contribute most strongly. Artificial light also changes how cavers experience scale. Headlamps illuminate only a small portion of a large chamber. The rest disappears into blackness, making distance difficult to judge. Reliable movement depends on ropes, maps, team communication and familiar equipment rather than broad visual landmarks. ## The final siphon and exploration limit At the lowest surveyed point lies a still underground lake known as **Captain Nemo's Last Stand**. The water occupies a terminal siphon, a passage in which the cave continues below the waterline. Its presence marked the practical endpoint for the 2018 dry-caving expedition. The lake's measured depth added 8.5 meters to the established survey. Beyond it may lie flooded tunnels connected to a deeper drainage system. Exploring those passages would require specialized cave-diving equipment, trained divers, breathing gas and a carefully supported route through more than two kilometers of cave. That logistical challenge is immense. Every cylinder and piece of diving equipment would have to be transported through narrow passages and lowered down repeated shafts. A problem at the terminal lake would occur several days from the entrance. Rescue options would be severely constrained by distance and terrain. The lower galleries have already produced material of interest to cave biologists. Organisms in such environments live without sunlight and depend on nutrients carried by water or introduced from upper levels. Studying them can reveal how life persists with limited energy in cold, isolated habitats. Veryovkina's known depth therefore represents both an exploration achievement and a measurement boundary. The 2,212-meter figure records the deepest point connected to the entrance by the team's survey. Water now guards the route ahead, leaving the cave's submerged continuation and its ultimate structure open to future investigation.