In Tampa, Florida, in February 2013, a giant hole opened up under the bedroom floor of Jeffrey Bush, swallowing the 36-year-old as he slept. His body was never found. Bush was a victim of a sinkhole -- a growing worldwide hazard that lurks wherever limestone and other water-soluble rocks underpin the soil. When carbon dioxide in the air dissolves in rainwater, it forms a weak a...$https://www.bilibili.com/video/av25777480/$天坑是喀斯特地貌的一种现象，原本就被溶蚀的石灰岩结构，如果里面有太多海洋生物化石，再有空隙给植物生长提供空间，就会出现巨大的空洞，有些离地面不远，有些被地下水填充形成岩洞适合探险者潜水。地下水开采过多，含水层就被掏空，地下岩洞塌陷，如果下暴雨，也就不可避免。佛罗里达到处都是。西班牙卡拉塔尤，古老的城市，石膏岩支撑和围绕。布兰托斯，机械化耕作留下大量盐滩，当地人会带着木棍出门，防止掉在天坑里。萨拉戈...
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