Planet Earth

BBC Four HD

7:15 PM to 8:15 PM

Thursday 28 August

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David Attenborough looks at the world's caves, including the Lechuguilla Cave in America, which contains chambers filled with 6m-long crystals. He observes creatures in Texas and Thailand that never see daylight, and inside Deer Cave in Borneo he finds five million bats whose droppings support an entire ecosystem