A fast-moving river of lava flowed from the Cumbre Vieja volcano on La Palma island in Spain Thursday. The Canary Islands Volcanology Institute called the flow a lava "tsunami." | CBS Sunday Morning

Twenty years ago today, on December 26th, 2004, a massive earthquake triggered the deadliest tsunami in recorded history. Multiple waves hit coasts through Southeast Asia, South Asia, Africa and beyond. Both tourists and locals scramble for safety, as the extent of the waves and their destruction become apparent. Discover the power of the human spirit through stories of hope, hardship, and heroism from the 2004 Indian Ocean tsunami. Watch Tsunami: Race Against Time tonight from 5pm, on National