S1, E1: The harrowing story of the 2004 Boxing Day tsunami that killed more than 250,000 people. Xand van Tulleken and Raksha Dave reveal how the catastrophe unfolded in this dramatic documentary. 12 hours before the first quake, vacationers enjoyed a blissful break unaware a combination of weather events was gathering force. What factors led to a tidal wave of unimaginable destruction?