Survivors of a massive tsunami which hit parts of the Asia-Pacific region recalled the nightmare of the 2004 Indian Ocean earthquake and tsunami. 

It was this day 15 years ago that Indian Ocean witnessed an intense 9.1-magnitude earthquake under the sea in northern Indonesia causing a tsunami with 17-meter high waves. The epicenter was found to be near the west coast of Sumatra.

The strength of the earthquake is thought to have had the energy of 23,000 Hiroshima-type atomic bombs.

Soon after the earthquake, the killer waves hit at least 11 countries, affecting people from east Africa to Thailand.

Read more: Mayhem of 2004 Indian Ocean tsunami recalled