On a foggy night in July 1956, two trans-Atlantic 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. Now, on the 50th anniversary of the disaster, "The Sinking of the Andrea Doria" combines archival footage, survivor accounts, interviews with divers, exclusive underwater images of the decomposing ship and CGI to lay bare exactly what happened that fateful night, explain why so many divers have lost their lives on the wreck and reveal a startling insurance company cover-up that has remained hidden for the last 50 years. More on PBS.org.