History of Son Doong Cave Formation: Discovering the Magnificent Geological Creation

The history of Son Doong began long before humans knew of its existence. Geologists estimate that the cave was formed around 2 to 5 million years ago.

• Initial formation: The cave was created by a powerful underground river flowing through the Ke Bang limestone mountain range. The water's force continuously eroded and dissolved the limestone along a geological fault line. This process occurred silently underground over millions of years, gradually carving out a massive tunnel inside the mountain range.
• Collapse and formation of sinkholes ("skylights"): Over time, at sections where the rock was weaker, the cave ceiling collapsed. These massive collapses formed large sinkholes (dolines), often referred to as "skylights". These sinkholes allow sunlight to beam down into the cave, enabling lush vegetation to thrive and forming unique primary jungles with their own distinct ecosystems right inside the cave.
• Creation of stalactites and stalagmites: Parallel to the erosion process, rainwater seeped through the limestone layer, dissolving calcium carbonate and dripping down from the cave ceiling. Over thousands and millions of years, this process created stalactite formations (hanging from the ceiling) and stalagmites (growing from the cave floor) with magnificent shapes and sizes, with some stalagmite columns in Son Doong reaching heights of up to 70–80 meters.

The result of this long and complex geological process is a cave of extraordinary scale, with its largest section spanning over 5 km in length, reaching up to 200 meters in height and 150 meters in width, large enough to house a 40-story skyscraper.

Although formed millions of years ago, Son Doong was only officially known to humans in the early 21st century.

Initial discovery (1990 - 1991): The first person to find the entrance to Son Doong Cave was a local man named Ho Khanh. In 1990 - 1991, during a trek into the jungle to look for agarwood, he encountered heavy rain and sought shelter under a rock arch. Standing at the cave entrance, he heard the roaring wind and the sound of a rushing underground river from within. Sensing something mysterious and a bit scary, he did not dare to venture deeper, staying only to take shelter from the rain before leaving.

Forgotten and rediscovered: After that incident, Ho Khanh could not recall the exact location of the cave entrance where he had sheltered. Despite numerous attempts to find it again, he was unsuccessful, though the story of the cave with whistling wind and the sound of an underground river remained vivid in his memory.

A fateful encounter and the exploration journey (2009): Years later, around 2007–2008, a cave exploration team from the British Cave Research Association (BCRA) led by Dr. Howard Limbert conducted surveys in Phong Nha. Mr. Ho Khanh had the opportunity to meet them and tell them about the mysterious cave entrance he had seen. This information immediately caught the exploration team's attention. In 2009, Ho Khanh set out once again to find it, and this time he successfully relocated the entrance to Son Doong Cave. Shortly after, he guided the BCRA team inside. This initial expedition confirmed the cave's enormous size and breathtaking beauty. The team managed to penetrate about 4.5 km deep before being blocked by a massive calcite wall, later named the "Great Wall of Vietnam".

Full conquest (2010): In 2010, the expedition team returned equipped with more specialized gear. They successfully scaled the nearly 90-meter-high "Great Wall of Vietnam" and fully explored the complete length of the cave.

Following the expeditions, photographs, footage, and measurement data of Son Doong were widely published. The world was awestruck by the existence of such a massive and stunning cave.

• 2013: Guinness World Records officially recognized Son Doong as the world's largest natural cave.
• 2014: The cave's prestige grew further when the renowned New York Times voted Son Doong as one of the 52 most attractive destinations on the planet.
• 2015: The cave was once again recognized by Guinness for having the largest natural cave volume in the world, reaching 38.5 million cubic meters. Also in this year, Son Doong made a historical mark in international media when it was filmed and broadcast live from inside the cave for the first time on ABC News' Good Morning America (USA). At the same time, National Geographic magazine released a 360-degree photo series accompanied by vivid immersive sound from inside the cave, offering an authentic experience to global readers.
• 2019: Son Doong's appeal extended into music when famous DJ Alan Walker chose this location as the backdrop for his "Alone Pt. II" music video. Released on December 27, 2019, the video quickly became a sensation, accumulating 275 million views by October 2022.
• 2020: Business Insider honored Son Doong as one of 20 record-breaking natural wonders of the world.
• 2021: Amid the global pandemic, National Geographic's 360-degree photos of Son Doong turned into a viral virtual reality (VR) tour, allowing people around the world to explore this wonder remotely.
• 2022: On April 14, commemorating the official announcement of Son Doong as the world's largest cave, a Google Doodle specially honored this natural wonder on its homepage across 18 countries, including Vietnam, the UK, Sweden, Thailand, Mexico, Brazil, and more.
• 2023: Most recently, on November 26, the majestic beauty of Son Doong once again captivated global audiences in Episode 6 (themed "Extreme") of Planet Earth III, the hit natural history documentary series by the BBC.

These events and accolades not only affirm the exceptional value of Son Doong Cave but also actively promote the stunning image of Vietnam's natural beauty to international friends.

Son Doong, the world's largest cave, harbors an exceptionally unique ecosystem thanks to its massive sinkholes ("skylights") where sunlight penetrates deep into the cavern. This has created conditions for an entire primary jungle to flourish with hundreds of diverse plant species, ranging from mosses and algae to trees standing tens of meters tall.

Inside Son Doong Cave, there is also a large underground river and lakes that shelter many endemic species. Notably, scientists have discovered over 7 new animal species (fish, insects, spiders, scorpions...) that have adapted to total darkness by losing their eyes and developing translucent bodies. With its immense scale, Son Doong even forms its own weather system with stable temperatures and occasional clouds (fog) floating within the cave. The unique interplay of geological features and sunlight has forged a fascinating, isolated ecological world found nowhere else on Earth.

Conquering Son Doong Cave is a wonderful yet challenging dream. Limited tour spots, high costs, and strict physical fitness requirements make it an exclusive luxury experience that is not easily accessible to everyone. However, that does not mean you are out of options to explore the "Kingdom of Caves" in Quang Binh! Hundreds of other magnificent caves await you with many more suitable choices. Explore our diverse Quang Binh Travel Tours. Contact Sovaba Travel now via hotline 0934.733.223 for advice and booking, and begin your own adventure!