However, the trip down in the old cave was not completely successful. All that is in his memory that Khanh is a large cave, blowing winds 24/24.
Even with the help of the sophisticated scientific equipment and software Google Earth, the expedition still Son Doong cave is not found. Must toinam 2009, he officially Ho Khanh rediscover ancient cave in.
4. Hang Son Doong "extra strength" became a airfields
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