In the final days of World War II, a mysterious German U-boat was seen by a United States naval vessel in the Atlantic Ocean, just north of South America.Before the ship could fire upon the sub, it vanished.History tells us that, after the war, the German high command scattered across world hoping to evade punishment for their crimes.What it doesn't tell us is what they took with them.Priceless paintings?Rare sculptures?Vast treasures?Many of these things have been discovered but there is one that remains hidden. It was one of the most well-hidden, secretive experiments the Nazis carried out during the war and now someone is trying to unearth it.If they succeed, it could bring civilization to its knees.