Horizon - Season 40 Episode 10
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. Geologists believed that all limestone caves were formed by rain and underground water percolating through cracks in the rocks. Absorbing carbon dioxide from the soil, this water becomes weak carbonic acid, nibbling away at limestone, etching out networks of subterranean caves.
First Air Date : 1964-02-04
Last Air date : 2024-07-22
Runtime : 57 minutes
Genre : Documentary
Cast :
Crew :
Quality : 
Subtitles :
- Season 40 : Episode 12003-01-09
- Season 40 : Episode 22003-01-16
- Season 40 : Episode 32003-01-23
- Season 40 : Episode 42003-01-30
- Season 40 : Episode 52003-02-13
- Season 40 : Episode 62003-02-20
- Season 40 : Episode 72003-02-27
- Season 40 : Episode 82003-03-06
- Season 40 : Episode 92003-03-27
- Season 40 : Episode 102003-04-03
- Season 40 : Episode 112003-04-17
- Season 40 : Episode 122003-05-08
- Season 40 : Episode 132003-05-29
- Season 40 : Episode 142003-11-13
- Season 40 : Episode 152003-11-20
- Season 40 : Episode 162003-11-27
- Season 40 : Episode 172003-12-04
- Season 40 : Episode 182003-12-11
- Season 40 : Episode 192003-12-18
