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

A tsunami has hit Tonga's largest island, Tongatapu, after an underwater volcano in the South Pacific erupted. | CNN

After a massive earthquake triggered the deadliest tsunami in recorded history, multiple waves hit the coast of Sri Lanka. Both tourists and locals scramble for safety, as the extent of the wave and its destruction become apparent. Discover the power of the human spirit through stories of hope, hardship, and heroism from the 2004 Indian Ocean tsunami. Parts one and two of Tsunami: Race Against Time premiere tonight at 9pm on National Geographic UK. | National Geographic UK

After a massive earthquake triggered the deadliest tsunami in recorded history, multiple waves hit Thailand. As the waves reach the beaches of popular resorts, locals and tourists work together to save lives. Survivors separated by the waves desperately search for their loved ones. Discover the power of the human spirit through stories of hope, hardship, and heroism from the 2004 Indian Ocean tsunami. Tsunami: Race Against Time premieres Monday November 25th at 9pm on National Geographic UK. | N