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Hang Son Doong, The Cave In Vietnam Thats So Massive A Boeing 747 Could Fly Through It
In the early 1990s, a Vietnamese man named Ho Khanh stumbled upon a massive cavern in the jungle. He didnt know it at the time, but hed made a groundbreaking discovery. Today, Hang Son Doong is recognized as the largest cave in the world.Despite his astonishment at the size of the caverns opening, Ho Khanh forgot where it was located for nearly 20 years. Then, around 2006, he ran into British cavers who were exploring the region. He told them about what he had once seen, and for the next two years, they searched for the cave together.Ryan Deboodt/Oxalis Adventure/FacebookHo Khanh came across the entrance to Hang Son Doong while searching for agarwood.Finally, in 2009, they found it again, and the cavers realized the true extent of Hang Son Doong. The cave stretched for more than five miles, and the main passage was so big that it could hold an entire New York City block complete with 40-story skyscrapers.Today, Hang Son Doong is a popular tourist attraction, though access is highly restricted. However, those who do have the opportunity to enter the cave leave in awe of one of the worlds most magnificent natural wonders.Click here to view slideshowBelow, read more about the world's largest cave. And above, look through 20 incredible photos of its otherworldly beauty.The Accidental Discovery Of Hang Son DoongAround 1991, a man named Ho Khanh was searching the jungles of central Vietnam for valuable agarwood to sell to support his family. He had ventured far from home when the weather suddenly turned, and he sought shelter beneath a large rock."I sat down with my back to a huge boulder," Ho Khanh told Vietnamese media in 2009. "Then something strange happened. I heard the sound of a strong wind and running water coming from behind me."Oxalis Adventure/FacebookHo Khanh sits outside the entrance to Hang Son Doong.Ho Khanh searched for the source of the noise and discovered a gaping cavern opening with a river rushing through it. "I was very surprised," he recalled. "I thought I knew many caves in this region, but this one was so different and seemed to be untouched by man. It was pitch black, but judging by the feeling of the air, I thought I was walking into a huge space. The strong wind blowing felt like something from the underworld."Ho Khanh had no way to explore the cave at the time, so he headed home and promptly forgot where it was. Over the next 15 years, he tried to find it on occasion, but he had no luck. Then, around 2006, he was approached by a group of British cavers.They had heard rumors of his discovery and wanted help locating the cavern. Ho Khanh renewed his search efforts, and while trekking through the jungle two years later, he heard a familiar sound. "I stopped by a big boulder," he said. "There was the same strong wind, the sound of water running I knew I'd found the cave at long last. I can't describe my feelings at the time, I was so overjoyed."He led the cavers to the site in 2009, and when they finally entered, they realized it had been well worth the wait.The Wonders Of The World's Largest CaveThe first major expedition into Hang Son Doong was carried out by members of the British Cave Research Association (BCRA). Their 2009 survey found that the cave was at least 5.5 miles long, but that wasn't its most impressive feature.Jason Speth/Oxalis Adventure/FacebookThe opening into the main passage of Hang Son Doong.The main passage of the cavern is the largest in the world. At 660 feet high and 490 feet wide, it's big enough for a Boeing 747 to fly through without its wings touching either wall. Explorers came across stalagmites that were 260 feet tall, and they dubbed a solid calcite flowstone deposit that towered 300 feet above their heads the "Great Wall of Vietnam." They also saw cave pearls spheres of calcium carbonate that form in the pools of limestone caverns that were the size of baseballs.Peter MacNab was one of the first men to enter Hang Son Doong. As he told CBS News in 2026, "Every corner you went 'round was completely new, completely exciting. And it just kept getting better and better as you went into the cave. It was absolutely spectacular."Ty Horton/Oxalis Adventure/FacebookVisitors to Hang Son Doong spend two nights in the massive cavern.In two areas, the roof has collapsed into the cavern, creating massive skylights open to the world above. Vegetation has made its way through these holes along with monkeys, birds, and insects creating a breathtaking miniature jungle inside the cave that's been compared to the landscape from the movie Avatar.Indeed, those who enter Hang Son Doong don't soon forget the awe-inspiring experience.Inside Hang Son Doong's Growing Tourism IndustryThe first tour group was permitted to enter the world's largest cave in 2013, paying $3,000 each for the opportunity. Since then, between 800 and 1,000 visitors have ventured to the site each year. Tourism is highly restricted, both for safety reasons and to preserve the cavern's fragile ecosystem.Vietnam's government once considered installing cable cars in the cave to promote additional tourism, but locals pushed back so fiercely that those plans were quickly abandoned, and conservation efforts were put in place.Oxalis Adventure/FacebookIn monsoon season, the river that flows through Hang Son Doong is dangerous, but visitors can boat on it during calmer times.Tours are prohibited between September and December due to rising water levels during peak monsoon season. The river that flows through Hang Son Doong can reach dangerous levels, blocking access to much of the cave and threatening to sweep away anyone inside. And while visitors are welcome from January through August, permits are required to join one of the 100 expeditions into the cave's depths each year.Ho Khanh, the man who first discovered Hang Son Doong, now helps lead these expeditions. He's known as the "king of the caves," and he's turned his passion for his country's environment into a career. His wife, Le Thi Nghia, told Vietnamese media in 2009 that she used to resent Ho Khanh's desire to explore his surroundings. "Sometimes I get angry because he just wants to go to the jungle and look at caves," she stated. "After all this, I'm proud of him."After exploring Hang Son Doong, the world's largest cave, learn about 21 more of the most beautiful caves in the world Then, look through these photos of Vietnam when it was a French colony.The post Hang Son Doong, The Cave In Vietnam Thats So Massive A Boeing 747 Could Fly Through It appeared first on All That's Interesting.
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