On a foggy night in July 1956, two transatlantic passenger ships collided in a tragic accident that spurred the largest naval rescue operation in history. The world watched in horror as the Andrea Doria, one of the grandest luxury liners, sank before their eyes. Using archival footage, survivor accounts, CGI and exclusive underwater images of the decomposing ship, the program explores exactly what happened that fateful night, explains why so many divers have lost their lives on the wreck and reveals a startling insurance company cover-up that has remained hidden for the last 50 years.