BBC Earth: The Power of the Planet

Since life first inhabited the Earth 4 billion years ago it has led a charmed existence. But every now and then something has happened to threaten the existence of life itself – a shock so great that it almost destroyed the Earth’s metabolism.

New imaging technology reveals the “scar tissue” of former disasters, like the great meteorite strike that helped destroy the dinosaurs. This huge crater off the coast of Mexico is only visible using magnetic anomaly imaging. But the impact has left its mark in other ways – Iain dives in spectacular flooded caverns called cenotes that are a legacy of that long ago disaster.

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