Inside world's largest cave with own ecosystem where humanity has rarely ventured
Hang Son Doong in Vietnam is widely considered to be the largest cave in the world - and it was only explored for the first time in 2009
A cave in Vietnam so vast it could fit several 40-storey skyscrapers standing upright was first explored by humans in 2009 - nearly 20 years after its entrance was discovered by chance.
……Read full article on The Mirror - World News
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