Expedition Unknown

Josh searches for more than 1,000 POWs lost in the Pacific Theater. He dives to find lost Allied soldiers on the Hōfuku Maru, a notorious Japanese "Hellship." Then, Josh receives unprecedented access to join a U.S. Department of Defense recovery mission.

A deep-water dive leads to the historic discovery of a lost WWII hellship, where an estimated 1,000 soldiers made the ultimate sacrifice. Given rare access, Josh assists a U.S. Department of Defense mission, recovering potential remains of American POWs.

Deep in the jungles of Laos, Josh must detonate unexploded ordnance from the Vietnam War before he can search for a lost culture's burial jars. Cutting-edge 3D scanning and facial recognition tech could finally shed light on this mysterious civilization.

A first-ever sonar survey reveals a submerged pirate lair located off the coast of Jamaica. Using groundbreaking photogrammetry, Josh dives in to hunt for the stolen treasure of Black Bart, the King of Pirates -- a fortune worth $50 million.