NHK纪录片《探索深渊：巴哈马蓝洞 Explorers of the Deep Bahamas Blue Holes 2013》英语无字-高清完整版下载
https://cdn.6867.top:6867/1AA/attachment/forum/wushi2/wp-content/uploads/2017/06/explorers-of-the-deep-bahamas-blue-holes1.jpeg《探索深渊：巴哈马蓝洞 Explorers of the Deep Bahamas Blue Holes 2013》
美国佛罗里达东南巴哈马的海床上点缀着近千个洞穴，这些石灰岩中的蓝洞是历经3.5万年形成的，洞中遍布千姿百态的钟乳石。水中含氧量极低，能见度可达100米。
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《探索深渊：巴哈马蓝洞 Explorers of the Deep Bahamas Blue Holes 2013》
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《探索深渊：巴哈马蓝洞 Explorers of the Deep Bahamas Blue Holes 2013》
https://cdn.6867.top:6867/1AA/attachment/forum/wushi2/wp-content/uploads/2017/06/explorers-of-the-deep-bahamas-blue-holes4.jpeg
《探索深渊：巴哈马蓝洞 Explorers of the Deep Bahamas Blue Holes 2013》
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《探索深渊：巴哈马蓝洞 Explorers of the Deep Bahamas Blue Holes 2013》
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