15 Deepest Caves Explored by Humans
The human fascination with exploring Earth’s hidden depths has led adventurous cavers to discover remarkable underground worlds that stretch far deeper than most people imagine. These natural wonders—formed over millions of years through water eroding limestone and other soluble rocks—create vast networks of chambers, passages, and vertical shafts that challenge even the most experienced explorers.
Venturing into these depths requires exceptional skill, specialized equipment, and remarkable endurance, as expeditions often last weeks with teams camping underground in complete darkness. Here is a list of 15 of the world’s deepest caves that brave explorers have managed to document, each representing the pinnacle of underground exploration achievement.
Veryovkina Cave
Located in Abkhazia, Georgia, Veryovkina currently holds the title of the world’s deepest known cave, reaching an astounding depth of 7,257 feet (2,212 meters). Russian explorers first began mapping this mammoth system in the 1960s, but it wasn’t until 2018 that its true depth was confirmed after decades of expeditions.
The journey to the bottom takes explorers through narrow squeezes, vast chambers, and underwater passages where temperatures hover around 40°F year-round.
Krubera Cave
Located in the Arabika Massif in Abkhazia, Krubera (also called Voronya Cave) was the deepest cave in the world until Veryovkina overtook it. This cave, which is 7,208 feet (2,197 meters) deep, has a complicated system of almost vertical drops, with some tunnels descending more than 500 feet straight.
Expeditions here are among the most technically demanding in the world because of the large number of sumps—water-filled channels that need dive gear—that explorers must traverse.
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Sarma Cave
Completing the trio of ultra-deep Abkhazian caves, Sarma descends to 5,062 feet (1,543 meters) beneath the Arabika Massif. First discovered in 1990, this cave system remained relatively unexplored until the 2010s when systematic expeditions began revealing its true scale.
Sarma’s unique feature is its particularly cold environment, with numerous ice formations persisting year-round even hundreds of feet below the surface.
Lamprechtsofen
The astounding 5,354-foot (1,632-meter) depth of Austria’s deepest cave system is located beneath the Leoganger Steinberge mountains. In contrast to many deep caverns, Lamprechtsofen features several entrances at varying altitudes, resulting in peculiar air circulation patterns that provide further difficulties for adventurers.
Evidence of centuries-old human trips to the cave can be found in the markings left by medieval miners who were looking for valuable minerals.
Gouffre Mirolda
Located beneath France’s Haute-Savoie region, this Alpine cave system descends 5,335 feet (1,626 meters) into the limestone of the Massif du Chablais. Discovered in 1971, Mirolda became the focus of intense exploration through the 1990s and early 2000s when French cavers pushed deeper through extremely narrow passages often partially filled with frigid water.
The connection of two previously separate caves—Mirolda and Lucien Bouclier—created this exceptionally deep system.
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Gouffre Jean Bernard
Another French Alpine marvel, the Jean Bernard system reaches 5,256 feet (1,602 meters) deep. This historic cave in the Haute-Savoie department briefly held the title of world’s deepest in the 1980s before being surpassed by discoveries in Abkhazia.
Exploration here is particularly difficult due to the cave’s tendency to flood rapidly during rainfall or snowmelt, with water levels rising tens of feet in hours.
Torca del Cerro del Cuevón
Spain’s deepest cave system, located in the Picos de Europa mountains, reaches 5,194 feet (1,589 meters) below the surface. This complex was formed through the connection of multiple cave systems discovered over decades of exploration.
The Picos limestone features some of Europe’s most vertical terrain both above and below ground, with the cave’s passages following the nearly vertical bedding planes of the mountain.
Cehi 2
Slovenia’s karst region hosts this 5,177-foot (1,588-meter) deep system within the Julian Alps. Formed in particularly pure limestone, Cehi 2’s passages are characterized by smooth, water-worn surfaces and massive chambers, some large enough to fit several buildings inside.
Slovenian cavers have been systematically exploring and mapping this system since the 1970s, with new discoveries still being made.
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Shakta Vjacheslav Pantjukhina
The fourth ultra-deep cave in Abkhazia’s Arabika Massif, this system descends 5,167 feet (1,576 meters). Named after a Russian caver who died during an expedition, this challenging system features numerous vertical drops connected by tight, winding passages.
What makes this cave particularly notable is the presence of several endemic species found nowhere else on Earth, including specialized crustaceans that have evolved in complete isolation.
Snežnaja Cave
Reaching 5,075 feet (1,550 meters) deep, this cave in the Western Caucasus mountains offers explorers a dramatic journey through various geological layers. The name translates to “Snow Cave” due to the massive snow plugs that form each winter near its entrance.
The lower sections feature massive fossil galleries formed when the cave was at sea level millions of years ago, providing scientists with valuable records of climate changes.
Sima de la Cornisa
This Spanish cave system in the Picos de Europa reaches a depth of 4,783 feet (1,458 meters). Discovered in the 1980s, Sima de la Cornisa’s exploration has been particularly challenging due to frequent rock falls and unstable passages.
The cave’s middle section features a series of enormous chambers connected by tight restrictions, creating a pattern cavers describe as “beads on a string.”
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Gouffre de la Pierre Saint-Martin
Straddling the border between France and Spain in the Pyrenees, this historic system descends 4,760 feet (1,451 meters). The cave gained international attention following a tragic accident in 1952 when explorer Marcel Loubens died after a winch failure during an ascent.
Despite this history, exploration continued, eventually revealing one of the largest underground chambers in the world—the Salle de la Verna, which is so vast it has been developed for tourist visits.
Illyuzia-Mezhonnogo-Snezhnaya System
This Russian cave network in the Caucasus Mountains plunges 4,688 feet (1,430 meters) through layers of limestone formed from ancient seabeds. Three previously separate caves were connected through years of difficult exploration to create this system.
The middle section features unusually warm air currents caused by geothermal activity, creating a strange microclimate where the temperature can be 20 degrees warmer than the surrounding passages.
Sistema Huautla
Mexico’s deepest cave, located in Oaxaca, reaches 4,639 feet (1,414 meters) deep and features over 52 miles of mapped passages. First explored in the 1960s, Huautla holds special significance in caving history as one of the longest-studied deep systems in the world.
The cave has cultural importance as well, with several entrances considered sacred by the local Mazatec people who have incorporated the cave into their spiritual practices for centuries.
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Système du Ragaï de Néoules
Found in southern France, this Mediterranean system descends to 4,606 feet (1,406 meters). Unlike many deep caves formed in cold mountain regions, the Ragaï developed in a much warmer climate, creating distinctive formations including massive gypsum crystals and unusual mineral deposits.
French cavers discovered this system relatively recently, with most exploration occurring since the 1990s and significant new passages still being found annually.
The Unseen Wilderness Below
These remarkable underground worlds represent just a fraction of what lies beneath our feet, with new discoveries continuing to reshape our understanding of Earth’s hidden dimensions. The exploration of these caves connects us to a primal human drive to venture into the unknown, using technology and teamwork to safely push the boundaries of the possible.
As mapping techniques and equipment improve, these record depths may soon be surpassed, revealing even more of our planet’s subterranean secrets.
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