洞穴隐秘生物 BBC Horizon:The Secret Life of Caves 2003年[全1集][2003年 BBC纪录片地平线 ]

Set against the back drop of awe inspiring geological beauty, a strange scientific adventure sets out to discover how a mineral clad cave network – the height of a 30 storey building and the length of six football fields – came to exist deep below the Guadalupe Mountains in North America.
But this journey soon unravels a multitude of inexplicable phenomena and obscure geological formations, leading to the discovery of extreme rock-eating microbes – a testimony from primordial Earth and a glimpse of life elsewhere in the Solar System.