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Ten years after one of the most deadly tsunamis ever known, scientists are making a shocking discovery. Experts used to believe that the biggest killer waves were only generated in a handful of regions, but mounting evidence now suggests that more of the world’s coasts, from the Mediterranean to Australia, could be in grave danger. But where will the next Big One strike?

Watch the full National Geographic: The Next Mega Tsunami movie online at no cost in high-definition (HD) quality. No downloads needed—simply click to play and experience the excitement with English subtitles included for your convenience.