Drone camera and GMA explore Vietnam jungle cave

Amazing video from ABC’s GMA.  Ginger Zee travels to Vietnam to explore Son Doong, an extraordinary cave deep inside the jungle.  With the help of DJI drones, GMA shows breathtaking video footage from the world’s largest underground chamber at Son Doong … the world’s biggest known cave … which is located near the Laos – Vietnam boarder. It was formed in Carboniferous/Permian limestone. Inside it has a large underground river.    The biggest chamber of Sơn Đoòng is more than 5 kilometres (3.1 mi) long, 200 metres (660 ft) high and 150 metres (490 ft) wide. The cave contains some of the tallest known stalagmites in the world, which are up to 70 m tall.