A tsunami is a string of immense waves that appear after earthquakes, volcanic eruptions, underwater landslides, and even asteroid impacts.

The largest mega-tsunami wave ever recorded was documented on July 9, 1958, in Lituya Bay, in Alaska. The height of the wave reached a stunning 1,720 ft (524 m).

This situation is no joke, and as soon as you find out that a tsunami is coming, you must act immediately to save your life. Here’s what you need to do right away.

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