Summary:
- A massive 300-meter-high tsunami could potentially hit the U.S. East Coast, putting millions of lives at risk.
- This type of "mega-tsunami" could be triggered by a massive underwater landslide off the coast of the Canary Islands, which could send a wall of water racing across the Atlantic Ocean.
- Scientists warn that such an event, while rare, could cause catastrophic damage and loss of life along the U.S. East Coast, and urge authorities to be prepared for the possibility of this type of natural disaster.