sink hole

  1. Cold Ethyl

    The ancient forest world discovered more than 600ft below the surface in huge sinkhole in China

    A huge ancient forest world has been discovered 630 feet underground, down a sinkhole in China. The underground mystery was stumbled upon in a Chinese 'Geopark' by a cave exploration team of scientists, in May last year. The phenomenon is also known in China as 'tiankeng' or 'heavenly pits'...
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