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Survey measurements indicate that Thang Cave runs nearly three kilometers deep.
It is around 70 meters wide, with certain expansive chambers stretching past 100 meters.
Inside the cavern, huge limestone pillars reach heights of up to 50 meters.
Visitors enter the cave by rappelling 20 meters down through a 5 sq.m opening, and exit by squeezing through a narrow passage large enough for only one person.
The cave was discovered in February 2026 by local resident Nguyen Quyet Thang, who felt a strong cold draft blowing out from a hidden cliff face and documented his finding with photos and videos.
After looking at them, a combined team from adventure operator Jungle Boss Tours and the National Park Management Board conducted a full survey in June 2026 before naming the cave after its discoverer.
Guided expeditions launched in August 2026 offer two-day adventure tours priced at VND7.6 million (US$300).
Pictured here are cave pearls inside Thang Cave. This cave has a larger number of them than most other caves in the park.
Phong Nha - Ke Bang National Park is a recognized UNESCO world natural heritage site famed for its ancient karst geography.
Explorers have cataloged 473 caves across the reserve, including Son Doong, En, and Pygmy, which rank as the world's first, second, and fourth largest caves.
Of the caves, 35 are currently open to tourists.
