What is the largest cave passage in the world?

The Son Doong cave, as it's called, measures 262 feet by 262 feet (80 meters by 80 meters) and at least 2.8 miles (4.5 kilometers) deep, making it the largest single cave passage ever discovered, according to National Geographic News, where the discovery was announced.



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The entrance to Cathedral Caverns in Grant, Alabama, USA, is the largest cave opening in the world. Measuring 38.4 m (126 ft) wide and 7.6 m (25 ft) high, Cathedral Caverns, which is approximately 1,220 m (4,000 ft) long, was originally known as the Bat Cave until it was developed into a tourist attraction after 1955.

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#1: Tennessee Caves (10,000) An astonishing 10,000 caves wind their way through the limestone bedrock, earning Tennessee the nickname “The Underground State.” Let's delve into this fascinating subterranean world, spotlighting three of the most unique caves that embody the state's captivating geological story.

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I crawled for 10 hours through the most claustrophobic cave in the world, Ogof Y Daren Cilau, which is home to one of the tightest squeezes known, 'The Vice'. The deeper you go into the cave, the tighter it becomes.

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Move with care
  1. Do not run or jump in a cave. Plan each move carefully.
  2. Do not enter a cave when there is rain predicted in the area. Cave often flood suddenly.
  3. Never touch or damage stalactites or other cave formations. These take thousands of years to grow.


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The deepest point in Kentucky's Mammoth Cave is called the “Bottomless Pit.” Despite its name, this pit is not actually bottomless. It is estimated to be around 140 feet (42.7 meters) deep.

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Most caves form through the dissolution of limestone by acidic groundwater. Limestones of the Paleozoic age are a common bedrock in the Appalachian Plateau and Valley and Ridge provinces of northwest Georgia, and those limestones are riddled with caves and other features formed by solution processes.

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We are cave-rich because underground streams have been eroding our region's limestone for millions of years, creating everything from tiny cracks to endless galleries to huge arenas, all below the surface of the earth.

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Hranice Abyss (Czech: Hranická propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic. The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater.

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What is the temperature inside the cave? Temperatures inside the cave vary somewhat, but usually hover around 54°F (12.2°C), year-round.

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Numerous people have died in the cave over the decades, including slaves and tuberculosis patients, but the exact number of deaths is unknown. For this reason, Mammoth is regarded as a haunted realm and many people have claimed to sense spirits, or have unexplained objects appear in their photos.

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Weather in caves tends to be very constant compared to surface conditions. Lehman Caves is 50 degrees Fahrenheit year round. The relative humidity varies between 90 and 100 percent.

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