536 AD. Somewhere in the world, a massive explosion occurs, sending billions of tons of dust and ash into the upper atmosphere. In the months that follow, global temperatures drop, crops fail, famine spreads and bubonic plague awakens. The impact is massive: the great empires of the ancient world wither or die and a new era emerges: the Dark Ages. To this day scientists still debate the origin of the explosion that changed the world. Did a meteorite or comet slam into the earth? Or was it a massive volcanic eruption? In 2012, our cameras were there for the discovery of incredible new evidence that could identify the culprit and solve the riddle behind one of the greatest mysteries of all time.