Will 21st century technology avert or accelerate the Apocalypse? Humanity has always featured stories and fears about the end of the world. But never before have we possessed such power to influence the dangers, manage the risks or cause such existential disaster. Presenters Timandra Harkness and Leo Johnson travel to NASA’s Los Angeles laboratory, and the site of the nuclear catastrophe at Chernobyl to understand the risks of disaster that face us in the next century. They discover how artificial intelligence might accelerate the demise of humankind, whilst also offering us a pathway to survival and redemption. And they learn how titanium wafers containing the entire library of human achievement and knowledge could safeguard our civilisation in the farthest corners of the universe.