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

On December 26th, 2004 a massive earthquake in the Indian Ocean sets off a tsunami that, within minutes, arrives in the bustling city of Aceh, causing unprecedented havoc and devastation. This four-part documentary follows the desperate struggle to survive of city-dwellers in Indonesia and tourists in Thailand caught in the unfolding catastrophe, as well as the scientists working against the clock to warn the world. Discover the power of the human spirit through stories of hope, hardship, and he

Marking 20 years since one of the deadliest natural disasters in history, Tsunami: Race Against Time takes a 360-degree look at the 2004 Indian Ocean tragedy. | National Geographic Africa