D-Day's Sunken Secrets

On June 6, 1944, the Allies launched the biggest armada in history to invade the Normandy beaches and liberate Europe from the Nazis. NOVA has exclusive access to the first complete survey of the seabed bordering the legendary beachheads, recounting the tumultuous events and revealing how the Allies' planning and advanced technology was vital to the ambitious and risky military operation.