1. Impact

Dr Xand van Tulleken and Raksha Dave tell the dramatic story of the Boxing Day Tsunami, which killed more than 250,000 people. They begin 12 hours before the disaster, on Christmas Day 2004, when holidaymakers across Asia were enjoying blissful breaks, unaware that a natural disaster was heading their way.

2. Destruction

Dr Xand van Tulleken and Raksha Dave pick up the story 90 minutes after the earthquake.