越南的孙洞穴在几十年后被发现. Vietnam's Son Doong cave explored after decades of discovery.

越南的一个巨大的洞穴在1990年代被当地人发现,并于2009年正式探索. A massive cave in Vietnam discovered by a local man in the 1990s was formally explored in 2009. 洞穴的长度近10公里, 有高的房间和地下河流. The Son Doong cave, stretching nearly six miles, features towering chambers and underground rivers. 据了解, 这座偏远地区的生态系统十分脆弱. A recent expedition highlighted the extreme difficulty of reaching the remote site and the fragility of its ecosystem.