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Structured Inside a Glacier in the Alps, the Cave Is Recreated Every Year and Visibly Shows the Advancement of Ice Melting in the 21st Century
The artificial glacier cave opened inside the Rhône Glacier in the Swiss Alps has become one of the clearest ways to visualize the melting ice from the inside.
Since 1993, workers have manually excavated the interior of the glacier, removing over 6,000 tons of ice over the decades to allow the tunnel to open and access its interior.
What started as a tourist attraction has turned into a physical portrait of warming, as the tunnel shortens, deforms, and needs to be rebuilt every year.
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Where Is the Cave Dug Inside the Rhône Glacier
The structure was created directly in the Rhône Glacier, located at an altitude of about 2,300 meters, near the Furka Pass, an alpine area with direct access to the ice.
The location allows visitors to get very close to the glacier body, something rare in high mountain areas, where the retreat of ice often distances human access.
The cave is not permanent. It only exists while the tunnel can remain open before melting makes the structure unstable.
Why the Tunnel Needs to Be Dug Again Every Year
Unlike a natural cave, this structure is totally artificial and depends on human work to exist, as the glacier is in constant motion.
The ice flows slowly, deforms, and reacts to temperature variations, which alters the shape of the tunnel over time.
At the beginning of the summer season, the cave usually extends for over 100 meters, but can lose more than 30 meters during the hottest months due to internal melting.
How Is the Handwork of Digging Ice Inside a Living Glacier
The opening of the tunnel takes about four weeks and involves direct cuts into the glacier’s body, made carefully to reduce the risk of collapse.
The ice does not behave like solid rock. It acts as a viscous material, slowly sliding and creating tensions that affect the cave’s walls and ceiling.
The internal temperature remains near the melting point, causing constant dripping, formation of water channels, and progressive thinning of the walls.
What Can Be Seen When Walking Through the Interior of the Blue Cave
Upon entering the cave, it is possible to observe layers of ice compacted over decades, internal fissures, and channels formed by the water from melting itself.
The intense blue color stands out because the dense ice absorbs almost all the colors of visible light, primarily reflecting blue.
As the weeks pass, visitors notice real changes in the structure, as parts of the tunnel disappear over the summer.
The White Blankets Used to Try to Slow Down the Melting of Ice
To reduce ice loss in specific areas, parts of the glacier receive white geotextile blankets during the warmer months.
These coverings reflect solar radiation and decrease heat absorption, reducing the melting rate by up to 70 percent, and can reach 80 percent in some areas.
Even with this effect, the technique does not prevent the glacier’s retreat and works only as a temporary solution.
Why the Cave Became a Physical Portrait of Melting in the Alps
Despite the interventions, the glacier continues to lose volume year after year, requiring the cave to be dug again each season.
The human effort to keep the tunnel open ends up highlighting the problem, as the structure only exists because the ice is disappearing.
The cave remains one of the few places where it is still possible to see, touch, and walk inside a living glacier, while it is rapidly shrinking in the Alps.
Pero a nosotros se nos cayó un trozo encima por el deshielo con consecuencias importantes
Pero a nosotros se nos cayó una parte del techo encima por el deshielo con consecuencias importantes