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Planet Earth

Episode 4: Caves

Duration: 57 minutes

on BBC Two Northern Ireland

Available for years

Documentary series which celebrates earth in all its natural glory. This edition looks at caves, including Deer Cave in Borneo, a daytime retreat for five million bats. Show more

BBC Two Northern Ireland

About BBC Two

BBC Two is a lively channel of depth and substance, carrying a range of knowledge-building programming complemented by great drama, comedy and arts.