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Han Son dung (Son Doong) (mountain river Cave)

Over the past year, twenty new caves have been opened in Vietnam, including the giant Han Son dung cave, or hang Sondong (the name can be translated as “mountain river Cave”). In fact, the local tribes that live in the jungle have long known about this cave, but they were afraid of it because of the whistling sounds that make the underground river flowing in this cave. The world community only became aware of this natural wonder in 2009, when a group of British researchers from the British Association of cave explorers (BCRA) examined this cave. The research was conducted from 10 to 14 April 2009.

The research team was led by Howard Limbert. According to his data, the Han Son dung cave is at least five times larger than the Phong Nha cave, which was still considered the largest in Vietnam.

Shondong cave (Son Doong) is located in Vietnam and was discovered in 1991 by a local resident Ho Khanh. In 2009, a group of British cavers led by Howard Limbert explored the cave. The cave was immediately included in the Guinness book of records. it is about 200 meters high and 150 meters wide, and is about 9 km long.
The largest hall of the Han Son dung cave is 5 km long, 200 m high and 150 m wide. It turns out that Han Song dung surpasses even the Malaysian deer Cave.
The beam of the lantern cuts through the damp air of the cave. Due to the mixing of air masses of different temperatures, clouds are formed even underground.
In the underground hall of the hang Son dung cave, there is enough space even for a 40-storey skyscraper.
Shandong is located in the national Park Phong Nha Provides (Phong Nha-Ke Bang), which is near the border with Laos.

Many years ago, the roof of the hang Son dung cave formed gaps through which light entered the underground halls, and with it came the plants. Now you can find a real jungle in the cave.

Shandong is located in the national Park Phong Nha Provides (Phong Nha-Ke Bang), which is near the border with Laos.

Vietnam is home to one of the largest cave systems in Asia. To preserve this unique natural feature, a special 330-square-mile Park was created in 2001. During the war with the United States, North Vietnamese soldiers actively used caves as shelters from bombing. Today, ponds have formed on the site of craters from exploding shells.
These tunnels in the rock were cut by the RAO Tuong river. During the dry months, the river turns into a small stream. But when seasonal flooding begins, the river becomes huge again, and the place where speleologists are now wading completely goes under water.
For cavers, discovering a huge cave like Sondong is like discovering an unknown mount Everest underground. The infographic is clickable.
This amazing structure on the rocks was created by streams of water for many thousands of years. In some places, the underground river that flows in the bowels of the hang Son dung cave runs along the surface of the earth.
Where there is enough light at the entrance to the cave, the limestone ledges are covered with a continuous carpet of delicate greenery.
Small depressions in the limestone are filled with cave pearls. This rare type of pearl grows by itself in pools of lime water. Its composition differs little from that of pearls produced by mollusks, but it does not have a beautiful mother-of-pearl luster. Nevertheless – this is a rare natural phenomenon, so the placer of cave pearls is always of great interest to cavers.
The greenery in this cave manages to penetrate even where there is clearly not enough light. After the plants, not only insects and snakes descend into the cave, but even monkeys and birds.

Beautiful cave lake.
In the underground hall of the hang Son dung cave, there is enough space even for a 40-storey skyscraper.

For millions of years, drops of water saturated with carbon dioxide dissolved the stone, creating beautiful curtains of giant sinter formations.
Under the floodlights, the rock itself begins to glow. The rains that had passed on the surface overflowed the water pools, and the water rushed down. Now speleologists will have to stop studying the cave and leave its halls.

Passages inside the hang Son dung cave are blocked by the monolithic rock Of the great wall of Vietnam. Therefore, finding the path leading to the cave was one of the most difficult tasks for a group of British cavers. All the stones of the cave walls are very slippery and constantly wet. To go down and up these almost vertical porous walls, and even in pitch darkness, you need the most reliable climbing equipment.
“Sweeney” Sewell says that when the water breaks into the cave, it goes with a roar like a train rushing. Scientists working in caves are constantly at risk of drowning in unpredictable underground streams. But, according to Howard Limbert, in a giant cave like hang Son dung, the risk of drowning is slightly less.
Often, the descent of a vertical stone wall is the only possible way to further advance into the depths of the cave. Huge boulders constantly block the road in absolute darkness. Caves are connected to each other in a giant network, and underground rivers, the volume of which increases many times during the rainy season, constantly change their course. During the rainy season, these caves become almost inaccessible to researchers and are filled with water.
According to the decision of UNESCO, in 2003 the national Park “Phong Nha-Ke Bang” was recognized as a world natural heritage site.
Giant stalagmites look like stone cacti in the light. This place was named by speleologists-cactus Garden.

This summer (2013), the government granted permission to tour operators to sell excursions to this amazing place. The cost of an excursion to the cave is not less than $ 3000.

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