On June 6, 1944, the Allies launched an armada to invade the Normandy beaches and liberate Europe from the Nazis. Hundreds of ships sank while running the gauntlet of mines and bunkers, creating one of the world's largest underwater wreck sites. Now NOVA has exclusive access to a unique collaboration among military historians, archaeologists and specialist divers to carry out the most extensive survey of the seabed bordering the beachheads. Dive teams, submersibles and underwater robots will identify... [see more] key examples of the Allied craft that fell victim to German shellfire, mines and torpedoes. The team will use the latest 3D mapping tools to plot the relics on the sea floor. Highlighting the ingenious technology that helped the Allies overcome the German defenses, "D-Day's Sunken Secrets" unfolds a vivid blow-by-blow account of the tumultuous events of D-Day and reveals how the Allies' intricate planning and advanced technology were vital to assure the success of the most ambitious and risky military operation ever launched.