The Earth's large, deep calcareous caves are virtually inaccessible and therefore barely explored - requiring expert diving where flooded. Some of its wildlife is as strange and specific as in the deep, darkest part of the ocean, whether physically adapted -notably to the dark. Nevertheless, some caves(did) play an important part in native cultures, even as sources of fresh water for some Mayan cities. Written by
Did You Know?
The cave crew had to spent a whole month filming on the world's largest pile of poo (actually bat guano) hosting thousands of cockroaches crawling into every corner of their clothes. See more
Himself - Narrator
This is our planet's final frontier, and a world where only the most adventurous dare to go.
[BASE jumper disappears into black hole
Featured in Zomergasten: Episode #24.1
Planet Earth Theme
Written by George Fenton
Performed by BBC Concert Orchestra See more