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Vietnam's Son Doong cave explored after decades of discovery.
A massive cave in Vietnam discovered by a local man in the 1990s was formally explored in 2009.
The Son Doong cave, stretching nearly six miles, features towering chambers and underground rivers.
A recent expedition highlighted the extreme difficulty of reaching the remote site and the fragility of its ecosystem.
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La cueva de Son Doong en Vietnam fue explorada después de décadas de descubrimiento.