The 2004 Indian Ocean earthquake caused a devastating tsunami that killed over 150,000 people across 11 countries. The earthquake occurred off the coast of Sumatra, Indonesia on December 26, 2004 and had been building forces underground for hundreds of years. When the earthquake struck, it unleashed giant killer waves that spread across the Indian Ocean at jet speeds, crashing into coastal areas and causing widespread destruction and loss of life in Indonesia, Thailand, Sri Lanka, India, and other countries.