On December 26, 2024, countries around the Indian Ocean mark the 20th anniversary of the devastating tsunami that killed approximately 230,000 people, primarily in Indonesia. Commemorative events include a solemn ceremony in Banda Aceh, Indonesia, where a siren echoed the moment the earthquake struck in 2004. Various memorials and religious prayers are planned across affected nations including Sri Lanka, India, and Thailand, reflecting on the tragic impact of this catastrophic event and the absence of an early warning system at the time.