By the end of 1944, Hitler knew the war was lost. In a final attempt to retain his wealth and power, he began a secretive operation to sneak treasure out of Germany. During the second world war, the Nazis looted everything they could get their hands on, including an estimated 600 tons of gold, thousands of pieces of artwork, and millions of priceless artefacts. The team believe some of these stolen riches lie stored in modified U-Boats that lie at the bottom of the of the Caribbean Sea. In Lost U-Boats of WWII, they set out to hunt them down.