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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.
Datum prvog emitiranja : Mar 05, 2006
Datum posljednjeg emitiranja : Dec 10, 2006
Epizoda : 11 Epizoda
Sezona : 1 Sezona
Vrijeme izvođenja: 48 minuta
Studio: BBC One
Uloge: David Attenborough