NAZI ATTACK ON AMERICA

NATIONAL GEOGRAPHIC / NOVA - Explorer Robert Ballard is famous for finding lost shipwrecks. Now he's going after a wreck that's not only been found, the Navy already knows how it was sunk... or does it? It is the German submarine U-166, and for decades the details of how she went down has been a mystery. The best clue is a young Navy captain who reported sinking her - but instead of getting credit he was removed from command and sent back to school. Now Ballard and his team will deploy a cutting-edge array of technology to get to the bottom of how U-166 really went down. In the process they'll uncover little know details about the deadly Nazi assault on America known as Operation Drumbeat and, in the end, finally set the record straight.