On August 27th, 1883 a series of blasts on the island of Krakatoa culminated in a colossal explosion that blew the island apart in one of the largest eruptions in recorded history. We explore the underground forces that led to this extraordinary explosion that killed over 36,000 people and the devastation that it caused. But this is not just history because Anak Krakatoa (the Son of Krakatoa) is growing bigger and bigger and will blow again.