Coral reef

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6. The Blue Planet: Coral Seas

This programme focuses on the amazingly fragile ecosystems of the world's coral reefs.

1. Tropic of Cancer: Mexico to the Bahamas

Simon Reeve starts his epic journey around the world following the Tropic of Cancer.

8. Life: Creatures of the Deep

A look at marine invertebrates, including Humboldt squid, starfish and giant octopuses.