In October 1962, the world held its breath. On the edge of the Caribbean Sea, just a few miles from the Florida coast, the two great superpowers were at a stand-off. Destruction seemed inevitable. After a tense few months of posturing and careful negotiation, the Cuban Missile Crisis was averted; the US and USSR went their separate ways. Fifty years later, this program reveals the shocking drama that took place underwater on board Soviet submarine B-59, which brought us so much closer to World War Three than anybody realised.