U-Boats were active from the first day of the war to the last. The menace provoked Winston Churchill to write, "The threat the U-Boats posed in the Atlantic was the only thing that really frightened me during the war. On their defeat hung the outcome of World War II." Witness the actions of the famed Wolf Packs in this riveting episode.

From New York to Florida, Americans were unaware that just a few miles off their shores, Hitler's U-Boats lurked ready to strike against their country. The German U-Boat fleet terrorized American coastal waters and vessel after vessel went down in one of the greatest maritime disasters of all time.

The largest U-Boat housed 44 crew members who lived in their weapons of war for days on end in cramped and squalid conditions. Of the 38,000 men who fought in these machines during World War II, 30,000 would die in their iron coffins. Experience the Allied strategies and tactics of 1943 that caused the men in the U-Boats to suffer the highest mortality rate of any fighting unit in the history of war.