![A Journey Through Hang Sơn Đoòng – THE LARGEST CAVE ON EARTH [Video]](https://i0.wp.com/www.geeksaresexy.net/wp-content/uploads/2018/05/cave.jpg?fit=1200%2C604&ssl=1)
A short movie about an incredible journey through Hang Sơn Đoòng, the largest cave on Earth.
As of 2009 it has the largest known cave passage cross-section in the world, and is located near the Laos–Vietnam border. Inside is a large, fast-flowing subterranean river. It was formed in Carboniferous/Permian limestone and is believed to be between 2 and 5 million years old. [Source]
https://www.youtube.com/watch?v=_f-qkGJBPts From Thomas Frank: If you want to cut your study time, using the Feynman…
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