U-Boats sunken in the Caribbean Sea may hold untold treasures from World War II, or so treasure hunter Darrell Miklos believes. During World War II, the Nazis stole upwards of 600 tons of gold, thousands of works of art, and millions of priceless items. Now, with two documents guiding his search, Miklos will set out to hunt for the stolen riches with a team of divers and researchers.

The hunt will be chronicled in the show ‘Lost U-Boats of WWII’ on the Sky History channel. Most of Miklos’s career has been dedicated to finding colonial-period shipwrecks, though he has always been infatuated with the hunt for sunken U-Boats. According to Miklos, evidence and information about them is lacking because the U.S. kept the information secret. He believes that these modified U-Boats transported stolen goods and high-ranking personnel. According to Miklos, other historians have not searched for the boats because the U.S. government claims to have discovered them all.

However, a U.S. Navy pilot whose job it was to locate U-Boats in the Caribbean shared a chart with Miklos that showed seven U-Boats off the coast of the Dominican Republic.

The Dominican Republic was a clandestine stop for U-Boats on their way to South America. Archival photographs of the German colony that sprang up in the D.R. depict a German man in full Nazi gear in Monte Cristi. Miklos followed this trail to a local eyewitness who had seen a Nazi U-Boat commander during the period.

“To me, that’s proof enough that there’s a lot more going on than what has been written about so far,” Miklos said in an interview with Sky History.

Read more here