They are the stealthiest of natural disasters, hiding the energy of a hydrogen bomb in a barely noticeable swell that races across the ocean at the speed of an airliner. And great tsunamis are as unpredictable as they are rare. A look at how the most powerful seismic event in 40 years spawned killer swells across the width of the Indian Ocean -- and how a warning system could have saved ten of thousands of lives.

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