Vietnam's Hang Son Doong cave is the largest in the world, with caverns
big enough to fit an entire city street inside them. The cave is located
near the Laos-Vietnam border. It has a large fast-flowing underground
river inside.
Son Doong Cave was found by a local man named Ho Khanh in 1991. The
local jungle men were afraid of the cave for the whistling sound it
makes from the underground river. It was not until 2009 that it became
public after a group of British scientists from the British Cave
Research Association, led by Howard and Deb Limbert, conducted a survey
in Phong Nha-Ke Bàng from April 10 through April 14, 2009. Their
progress was stopped by a large calcite wall.
According to the Limberts, this cave is five times larger than the Phong
Nha cave, previously considered the biggest cave in Vietnam. The
biggest chamber of Sơn Đoòng is more than five kilometers long, 200
meters high, and 150 meters wide. With these dimensions, Son Doong
overtakes Deer Cave in Malaysia to take the title of the world's largest
cave.
Source :- http://www.unbelievableinfo.com/2013/12/worlds-largest-cave-son-doong.html
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