Planet Earth - Season 0 Episode 20
The freshwater pools that dot Mexico's Yucatan peninsula were believed by the Mayans to be portals to the underworld. For the first time ever, the BBC Natural History Unit explores this incredible, labyrinthine system of underground rivers.
First Air Date : 2006-03-05
Last Air date : 2006-12-10
Runtime : 57 minutes
Genre : Documentary
Cast : David Attenborough
Crew : Hans Zimmer (Executive Music Producer), Tom Hugh-Jones (Executive Producer), Michael Gunton (Executive Producer), Alastair Fothergill (Executive Producer), George Fenton (Music), Alastair Fothergill (Producer)
Quality : 
Subtitles :
- Season 0 : Episode 12006-03-05
- Season 0 : Episode 22006-03-12
- Season 0 : Episode 32006-03-19
- Season 0 : Episode 42006-03-26
- Season 0 : Episode 52006-04-02
- Season 0 : Episode 62006-11-05
- Season 0 : Episode 72006-11-12
- Season 0 : Episode 82006-11-19
- Season 0 : Episode 92006-11-26
- Season 0 : Episode 102006-12-03
- Season 0 : Episode 112006-12-10
- Season 0 : Episode 122006-11-26
- Season 0 : Episode 132006-12-03
- Season 0 : Episode 142006-12-10
- Season 0 : Episode 152006-10-11
- Season 0 : Episode 172007-05-30
- Season 0 : Episode 182008-01-04
