Vietnamese farmer discovers a spectacular world:
Sơn Đoòng cave, estimated 5M years old, is the world's largest cave
Speisa: 05 October 2017
Sơn Đoòng cave, estimated 5M years old, is the world's largest cave
Speisa: 05 October 2017
Son Doong Cave:'A lost world below the surface'
Russian explorers film in world's biggest cave with drone (VIDEO)
RT : 12 November 2017
Russian explorers film in world's biggest cave with drone (VIDEO)
RT : 12 November 2017
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Scroll down for pics and video.
The Sơn Đoòng cave in Vietnam is undoubtedly one of the most spectacular places we can visit on the planet. It was first discovered by a local farmer in 1991, but it took 18 years before scientists were able to make their way into the cave and see what was hiding there. What a sight it must have been! The Sơn Đoòng cave is not only the world's largest cave, it is a separate little world. Under the roof there is enough space to fit a 40 storey skyscraper. It has its own separate jungle, a river and a rich wildlife. The cave is five times larger than Phong Nha cave, a nearby cave previously considered the biggest cave in Vietnam. Sơn Đoòng means "Mountain river cave" and the researchers estimate that the cave is about five million years old. The largest room in the Sơn Đoòng cave is more than five kilometers long and stretches 200 meters into the air. With these dimensions, Sơn Đoòng overtook Deer Cave in Malaysia in 2009 to take the title of the world's largest cave. In 2013 the first guided tour was arranged to Son Doong. The price was rigid [stiff] - $3,000 for five nights in tents. But then you would have a nature experience that very few people ever had. 
Vimeo Video: 'Hang Son Doong'
From Ryan Deboodt Take an otherworldly journey through Hang Son Doong, the world's largest cave, by both ground and air. Filmed near the entrance and the first and second dolines (skylights) which are 2.5 and 3.5 km inside the cave respectively. Gear Canon 6D Canon 16-35mm f4 DJI Phantom 2 GoPro Hero 4 Black ryandeboodt.com Find me on Instgram - instagram.com/rdeboodt Find me on Facebook - facebook.com/RyanDeboodtPhotography For licensing/usage please email - [email protected] Music: A Glow - Dan Phillipson A group of Russian travelers explored one of the most spectacular yet least visited natural landmarks in the world - the Son Doong Cave located in the jungles of inland Vietnam.
The world's biggest known cave, formed as a result of a cave in caused by a mountain river at least two million years ago, was stumbled upon by a local man in 1991. At at its widest, it measures 150 by 200 meters, stretches for over 5 kilometers, and has a volume of 38,5 million cubic meters, about twice the size of the next largest underground hollow. 
© cameraptor
© cameraptor
Son Doong was entirely closed to visitors until 2013, and the Russian team of six spent a year arranging permits for the trip.
Their journey through the cave took four days of arduous climbs interspersed with spectacular sights, such as some of the world's most imposing stalagmites, fast-running streams, and an underground forest. 
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"It's peaceful here, you feel completely detached and free. This is what you call a reset," said one of the travelers, Ernest Rudyak, in a video diary of the journey. "It is a sanctuary, a lost world below the surface - a unique ecosystem."
© cameraptor
Only about 2,000 outsiders are thought to have traveled to the remote location, and fewer than a dozen have filmed inside with a drone. Only limited tours costing several thousand dollars are made available each year, and those sell out in hours.
© cameraptor
But the government wants to capitalize on what has been a UNESCO World Heritage Site since 2003, and has proposed a cable car route through the cave. A spate of protests delayed construction in 2014, but the $200 million plan that would allow hundreds to visit the cave each day, remains on the table.
© cameraptor
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