How do they do this?
Extraordinary!
http://news.nationalgeographic.com/2015/05/150520-infinity-cave-son-doong-vietnam-virtual-tour-photography-conservation/?utm_source=Atlas+Obscura&utm_campaign=384fcd8fa6-&utm_medium=email&utm_term=0_62ba9246c0-384fcd8fa6-59905913&ct=t()&mc_cid=384fcd8fa6&mc_eid=866176a63f
Extraordinary!
http://news.nationalgeographic.com/2015/05/150520-infinity-cave-son-doong-vietnam-virtual-tour-photography-conservation/?utm_source=Atlas+Obscura&utm_campaign=384fcd8fa6-&utm_medium=email&utm_term=0_62ba9246c0-384fcd8fa6-59905913&ct=t()&mc_cid=384fcd8fa6&mc_eid=866176a63f
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