In 2011, a powerful earthquake off the coast of Japan unleashed a huge Tsunami that killed more than 15,000 people. But the worst tsunami of all occurred in 2004, just a day after Christmas, when a Tsunami delivered truly unprecedented chaos and destruction to South Asia, caused the death of an estimated 280,000 people across 14 countries. Using survivor testimony and fascinating expert insights, we’ll investigate these two unimaginable tragedies.