The Crystal Cave harbors the largest crystals known to humankind on the planet and is an incredibly beautiful yet extremely dangerous place where a person can perish in just 10 minutes.
The Crystal Cave in Mexico can kill a person after only 10 minutes of exposure without protective gear / © Reddit
In the year 2000, in the Sierra de Naica mountains of Mexico, at a depth of 300 meters, researchers discovered the incredible Crystal Cave. Within this U-shaped cavity, measuring 30 by 10 meters, enormous crystals have grown, the largest of which reaches 11.4 meters in height and weighs a colossal 12 tons.
IFLScience writes about the history of this deadly natural wonder.
Why the Cave is Lethally Dangerous
Despite its picturesque appearance, tourist access is strictly forbidden. The conditions inside are extreme: the stable temperature is maintained at 58 degrees Celsius, and humidity reaches 90–99%.
If a person remains there without protection for more than 10 minutes, fluid will begin to accumulate in their lungs, which can lead to death. For cave exploration, scientists use special thermal protective suits with breathing apparatus, but even in these, work can only be conducted for a maximum of one hour.
The crystals themselves are extremely slippery due to condensation, and their structure is very soft (only 2 on the Mohs hardness scale), meaning they can easily break under a person’s weight. Moreover, the crystals are so soft that they can be scratched simply by running a human fingernail, which has a hardness of about 2.5, across the surface.
How the Giant Crystals Formed
Approximately 26 million years ago, volcanic activity led to the formation of Mount Naica, and its caves became filled with hot water rich in calcium sulfate. As the water slowly cooled to 58°C, the formation of gypsum crystals began. Scientists believe these giants continuously grew under the mineralized water for 500,000 to 1 million years. In 2017, NASA microbiologists even discovered living microbes inside the crystals, estimated to be around 50,000 years old.
However, mining operations halted these natural processes. In their search for lead, zinc, and silver, mining companies pumped water out of the underground, putting the enormous crystals at risk of collapse under their own weight. Mining was only stopped in 2015, allowing water to gradually refill the cave, thereby resuming the growth process of this unique natural wonder.
In related news, archaeologists discovered a three-meter-long cave painting deep within a cave in Alabama. They found massive petroglyphs that had remained unseen for centuries.
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