The biggest chamber of Son Doong is over five kilometers in length, 200 meters high and 150 meters wide.
Son Doong Cave (in Vietnamese: Hang Son Ðoòng, meaning Mountain River Cave) is one of the most newly-found caves in the national park. Found by British cave scientists of the British Cave Research Association, it is regarded as the largest cave in the world.The biggest chamber of Son Doong is over five kilometers in length, 200 meters high and 150 meters wide. With these tremendous dimensions, Son Doong overtakes Deer Cave of Malaysia to take the title of world’s largest cave. Because the fast flowing underground river in the cave deterred the explorers from going farther, they are only able to estimate the length of the cave using a flashlight. They will carry out further exploration in the near future. The cave had been discovered by a native man in 1991, but he could not remember the way to the cave until January, 2008. From the end of March to April 14, 2009, he helped the explorers to traverse the 10 kilometer forest pass to access the cave mouth. Because of the difficulty in traversing into the cave as well as dangerous conditions in the cave, the cave will be open only to scientists in the near future. The 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. However, not until 2009 was it made known to the public when a group of British scientists from the British Cave Research Association, led by Howard and Deb Limbert, conducted a survey in Phong Nha-Ke Bang from April 10–14, 2009.Their progress was stopped by a large calcite wall. According to Limbert, this cave is five times larger than the Phong Nha cave, previously considered the biggest cave in Vietnam. The biggest chamber of Son Doong is over five kilometers in length.
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