Vietnam: World's Largest Cave Passage

Exciting news from Vietnam - caves big enough to hold a square block of New York City 40-story skyscrapers! One of Travel Pangea's favorite cave systems already are the caves in Ha Long Bay Vietnam. It will be exciting to see these caves develop and hopefully one day soon be accessible to tourists (who will be mindful to not disturb the underground eco-system)!

In Vietnam, World's Largest Cave Passage - Pictures, More From National Geographic magazine: "In the spring of 2009, Sims was a member of the first expedition to enter Hang Son Doong, or “mountain river cave,” in a remote part of central Vietnam. Hidden in rugged Phong Nha-Ke Bang National Park near the border with Laos, the cave is part of a network of 150 or so caves, many still not surveyed, in the Annamite Mountains. During the first expedition, the team explored two and a half miles of Hang Son Doong before a 200-foot wall of muddy calcite stopped them. They named it the Great Wall of Vietnam. Above it they could make out an open space and traces of light, but they had no idea what lay on the other side. A year later, they have returned—seven hard-core British cavers, a few scientists, and a crew of porters—to climb the wall, if they can, measure the passage, and push on, if possible, all the way to the end of the cave."