PBS纪录片《天坑—活埋 Sinkholes Buried Alive 2015》英语英字-高清完整版下载
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天坑又称沉洞，指地面突然大面积下陷，吞噬地表的房屋道路和生命，一般出现于有水流经的石灰岩岩层。本片讲述天坑出现的地质原因以及预防措施。
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天坑—活埋 Sinkholes Buried Alive
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天坑—活埋 Sinkholes Buried Alive
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天坑—活埋 Sinkholes Buried Alive
中国天坑纪录片推荐：《秘境中国：天坑 Mystery Caves》国语中字 1080P高清 秘境中国系列纪录片
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