A Chance Discovery
In 1991, Hồ Khanh, a local farmer in Vietnam’s Quảng Bình province, stumbled upon a massive cave entrance deep in the jungle. A deafening roar of rushing water echoed from within, deterring him from exploring further. For years, the cave remained a mystery, known only to locals.
The Largest Cave on Earth
In 2009, British cave explorers Howard and Deb Limbert, guided by Hồ Khanh, officially surveyed Sơn Đoòng. Measuring over 9 kilometers in length, with ceilings reaching 200 meters, it was declared the world’s largest cave by volume. Some chambers are so vast they could fit an entire city block, including skyscrapers.
A Lost Ecosystem
Sơn Đoòng contains its own jungle, complete with towering trees and unique species. Massive dolines—collapsed sections of the ceiling—allow sunlight to penetrate, creating a thriving ecosystem. Inside, rare cave pearls, enormous stalagmites, and underground rivers stretch for miles.
A Natural Wonder
Since its public opening in 2013, Sơn Đoòng has drawn scientists and adventurers alike. Due to its delicate environment, only a limited number of visitors are permitted each year. Researchers continue to uncover new geological formations, making it one of the last great frontiers of exploration.
Deep in the jungles of Vietnam lies a hidden world. In 1991, farmer Hồ Khanh found a massive cave but was too afraid to enter. For years, its vastness remained unknown, concealed beneath the earth.🧵👇 pic.twitter.com/EBDLKoBcBB
— Detective Tiger's Stories (@TigerDetective) January 29, 2025