In 2004, a large earthquake in the Indian Ocean triggered the largest tsunami in recorded history. One of the countries hit by the tsunami was Sri Lanka, where the wave caused one of the worst train disasters in human history when it hit the Queen of the Sea passenger line, which was carrying 1,500 passengers along Sri Lanka's west coast. Watch Destruction Decoded on Wednesdays at 8pm on National Geographic UK. | National Geographic UK

31K views · 335 reactions | It has been 20 years since the catastrophic 2004 Boxing Day tsunami swept across the Indian Ocean and caused death and destruction on an immense scale. | Sky News Australia | Facebook