First Aired: Mar. 26, 2006 on BBC One
Season 1 » Episode #04 - Caves
Summary: David Attenborough looks at the world's caves, including the Lechuguilla Cave in the USA which contains chambers filled with six-metre-long crystals. Inside Deer Cave in Borneo he finds five million bats, whose droppings support an entire ecosystem, and observes creatures in Texas and Thailand who never see daylight, leaving them with neither eyes nor colour.
Who appeared in this episode?[no credits found]
- 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.