NHK纪录片《水下小宇宙：奥尔达洞穴 Underwater Universe of the Orda Cave 2017》英语无字-高清完整版下载
https://cdn.6867.top:6867/1AA/attachment/forum/wushi2/wp-content/uploads/2017/09/underwater-universe-of-the-orda-cave.jpg水下小宇宙：奥尔达洞穴 Underwater Universe of the Orda Cave
奥尔达海底洞穴是世界上最长的水下石膏晶体洞，位于俄罗斯乌拉尔地区。在水蚀作用下天然形成的一段3英里长的岩溶隧道。本片采用4K摄影机拍摄，展现3亿年来大自然的鬼斧神工。
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水下小宇宙：奥尔达洞穴 Underwater Universe of the Orda Cave
https://cdn.6867.top:6867/1AA/attachment/forum/wushi2/wp-content/uploads/2017/09/underwater-universe-of-the-orda-cave1.jpg
水下小宇宙：奥尔达洞穴 Underwater Universe of the Orda Cave
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水下小宇宙：奥尔达洞穴 Underwater Universe of the Orda Cave
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