Seventy years ago, one of history’s most significant amphibious operations was launched from England’s southern coast. In just a few hours, 7,000 ships had transported 156,000 soldiers to the Normandy beaches. This operation not only altered the war’s trajectory but also marked the debut of groundbreaking scientific and engineering innovations. In this program, engineer Rob Bell delves into the mechanics that enabled this remarkable invasion. From massive gliders designed to carry troops to amphibious tanks, the program explores how necessity spurred invention. However, like all new technologies, not every invention succeeded, sometimes with catastrophic results. We uncover the reasons behind these failures. This is the science behind D-Day.