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It is one of the deadliest attacks on American civilians in US history, and it is all but forgotten today.  Just weeks after the US enters WWII, German submarines - U-boats - begin attacking US cargo ships just off the US coast. America is completely unprepared for this attack, and the loss of life is severe. Today, famed underwater explorer, Dr. Robert Ballard and his team will explore an underwater battleground in the Gulf of Mexico and identify the wrecks of one such U-boat and its last victim, which rest only a mile apart on the sea floor.