The Indian Ocean tsunami: 20 years later

On December 26, 2004, a 9.1-magnitude earthquake triggered a devastating tsunami in the Indian Ocean. Over 227,000 lives were lost across 15 countries and there were millions of dollars in material damages. This was one of the worst natural disasters of the 21st century. But 20 years on, what have we learned from it? In this gallery, we look back at the Indian Ocean tsunami to remember what was done and what the future of tsunami prevention looks like. Click on.