The document summarizes the impact of the 2004 Indian Ocean tsunami, which killed over 230,000 people across several countries. It discusses the challenges faced in relief efforts, including disease outbreaks, floods, and land mines. It also notes that over 1 million people were left homeless. Additionally, it examines the social impacts, such as differences in effects on men and women. It outlines emergency preparedness measures like early warning systems and inundation maps. Finally, it discusses a 2009 disaster response exercise across 18 countries.